Python-3.4.3/C2/Loading-Data-From-Files/English-timed - Revision history

Sandhya.np14 at 11:13, 14 June 2019

2019-06-14T11:13:30Z

Sandhya.np14 at 11:10, 14 June 2019

2019-06-14T11:10:44Z

Sandhya.np14 at 09:35, 14 June 2019

2019-06-14T09:35:01Z

Sandhya.np14 at 09:04, 14 June 2019

2019-06-14T09:04:01Z

PoojaMoolya at 05:24, 11 June 2019

2019-06-11T05:24:04Z

Pratik kamble at 09:56, 30 May 2019

2019-05-30T09:56:05Z

Pratik kamble at 09:37, 30 May 2019

2019-05-30T09:37:27Z

Pratik kamble: Created page with "{| border=1 |'''Time''' |'''Narration''' |- | 00:01 | Hello Friends and Welcome to the spoken tutorial on '''"loading data from files".''' |- | 00:07 | In this tutorial you..."

2019-05-30T09:34:34Z

Created page with "{| border=1 |'''Time''' |'''Narration''' |- | 00:01 | Hello Friends and Welcome to the spoken tutorial on '''"loading data from files".''' |- | 00:07 | In this tutorial you..."

New page

{| border=1
|'''Time'''
|'''Narration'''

|-
| 00:01
| Hello Friends and Welcome to the spoken tutorial on '''"loading data from files".'''

|-
| 00:07
| In this tutorial you will learn to,

Read data from files, which contain data in:

Single column format

Or multiple columns separated by spaces or other delimiters

|-
| 00:21
| To record this tutorial, I am using

'''Ubuntu Linux 14.04''' operating system

'''Python 3.4.3'''

'''IPython 5.1.0'''

|-
| 00:37
| You should know how to run basic '''Python''' commands on the '''ipython console.'''

|-
| 00:43
| If not, for relevant Python tutorials, please visit this website [http://spoken-tutorial.org/ http://spoken-tutorial.org]

|-
| 00:49
| Let us first open the '''Terminal '''by pressing '''Ctrl+Alt+T '''keys simultaneously. Now, type '''ipython3''' and press '''Enter'''.

|-
| 01:02
| Let us initialise the '''pylab''' package.
Type '''percent pylab '''and press''' Enter.'''

|-
| 01:12
| Let us begin with reading the file''' primes.txt'''. This file contains a list of prime numbers listed in a column.

|-
| 01:22
| Type'' '''''cat'''''(space)'''''primes'''''(dot)'''''txt''''' ''

|-
| 01:29
| We can use the''' cat''' command to fetch data from the file and display it on the terminal.''press ''Enter

|-
| 01:38
| We see the prime numbers are displayed on the terminal.

|-
| 01:42
| Now we can use the '''loadtxt()''' command to store this list into the variable''' primes'''.

|-
| 01:50
| SoType'' '''''primes'''''(equal to)'''''loadtx'''''t(within parentheses)(within double quotes)'''''primes'''''(dot)'''''txt''''' and press''' ''Enter.'''

|-
| 02:07
| Please make sure that you provide the correct path to the file, ''''primes.txt'.'''

|-
| 02:13
| The file, in our case, is present in the '''home''' folder.

|-
| 02:18
| '''primes''' is now a sequence of prime numbers, that was listed in the file, '''primes.txt'''.

|-
| 02:25
| Now let us display the contents in the variable '''primes.'''

|-
| 02:29
| So, type, '''print''' (within '''parentheses''') '''primes''' and press '''Enter'''. We see the sequence printed.

|-
| 02:41
| We observe that all the numbers end with a period '''‘.’'''. This is because all these numbers are '''floats.'''

|-
| 02:51
|Now Type '''cat'''''(space)'''''pendulum'''''(dot)'''''txt ''' Press '''Enter'''.

|-
| 03:01
| This file contains two columns of data. This first column contains the length of the '''pendulum'''.
The second column contains the corresponding '''time period'''.

|-
| 03:15
| Let us now read the data from the file into the variable''' pend''' using the''' loadtxt''' command.

|-
| 03:23
| So Type '''pend'''''(equal to)'''''loadtxt'''''(within parentheses)(within double quotes)'''''pendulum'''''(dot)'''''txt''''' ''and'' press''' Enter.'''''

|-
| 03:39
| Please note that '''loadtxt''' needs both the columns of the file to have equal number of rows.

|-
| 03:47
| Now print the variable''' pend''' to see what it contains.
Type'' '''''print'''''(within parentheses)'''''pend''''' ''and press''' Enter.'''

|-
| 04:00
| Notice that''' '''variable has two sequences containing two columns of the data file.

|-
| 04:07
| Let us use an additional argument of the''' loadtxt''' command to read the data into two separate sequences.

|-
| 04:16
| So Type '''L'''(comma)'''T'''''(equal to)'''''loadtxt'''''(within parentheses within double quotes)'''''pendulum'''''(dot)'''''txt'''''(after double quotes comma)'''''unpack'''''(equal to)'''''True''''' ''

And press '''Enter.'''

|-
| 04:42
| Now print the variables''' L''' and''' T''', to see what they contain.

|-
| 04:47
| Type'' '''''print'''''(within parentheses)'''''L''''' ''and press''' Enter'''

Type'' '''''print'''''(within parentheses)'''''T '''and press''' Enter'''

|-
| 05:01
| Notice, that''' L''' and''' T''' now contain the first and second columns of data from the '''pendulum.txt '''respectively

|-
| 05:12
| '''unpack(equal to)True''' has made the two columns into two separate and simple sequences.

|-
| 05:20
| Pause the video over here and try out the following exercise and resume the video.

|-
| 05:27
| Read the data from the file''' pendulum'''''(underscore)'''''semicolon'''''(dot)'''''txt. '''

|-
| 05:33
| This file contains data in two columns. These columns are separated by semicolons.

Use the''' IPython''' help to see how to do this.

|-
| 05:45
| Let us look at the solution. Switch to the terminal.

|-
| 05:50
| First we will see the content of the file.

|-
| 05:54
| So type '''cat''' space '''pendulum'''''(underscore)'''''semicolon'''''(dot)'''''txt''' Press ''' Enter''' We see the two columns separated by a '''semi-colon'''.

|-
| 06:12
| Now, type'' '''''L'''''(comma)'''''T'''''(equal to)'''''loadtxt''''' (within parentheses within double quotes) '''''pendulum'''''(underscore)'''''semicolon''''' (dot)'''''txt'''''(after double quotes comma)'''''unpack'''''(equal to)'''''True'''''(comma)'''''delimiter'''''(equal to)(within double quotes)'''''semicolon'''''.''

And press '''Enter'''.

|-
| 06:49
| Now'' '''''print'''''(within parentheses)'''''L''' and press '''Enter.'''

'''print'''''(within parentheses)'''''T '''''and press'' '''Enter. '''

|-
| 07:03
| This will display the contents inside the two variables '''L''' and '''T.'''

|-
| 07:09
| This brings us to the end of this tutorial. In this tutorial, we have learnt:

To read data from files using the '''loadtxt()''' command.

|-
| 07:20
| The data can be in

A single column format Or multiple column format, separated by spaces or other delimiters.

|-
| 07:31
| Here are some self assessment questions for you to solve

1. '''loadtxt''' can read data only from a file with one column. Is it True or False?

2. Given a file''' data.txt''' with three columns of data separated by spaces.

Read it into 3 separate simple sequences.

|-
| 07:58
|1. Given a file''' data.txt''' with three columns of data separated by '''colon'''. Read it into 3 separate simple sequences.

|-
| 08:09
| Now let us look at the answers, The answer to the first question is False.

|-
| 08:17
| The '''loadtxt() '''command can read data from files having single columns as well as multiple columns.

|-
| 08:25
| The answer to the second question is,

To separate data into three columns, we use the''' loadtxt()''' command as follows:

|-
| 08:35
| '''x('''''equal to)'''''loadtxt'''''(within parentheses and within double quotes'')'''data'''''(dot'')''txt''(after double quotes ''comma'')'''unpack'''(equal to)'''True'''

|-
| 08:50
| The answer to the third question is, We read into three separate sequences by using an additional argument of delimiter in the loadtxt command.

|-
| 09:03
| So'''x'''(''equal to'')'''loadtxt'''('' within parentheses, within double quotes'')'''data'''''(dot)'''''txt'''(after double quotes ''comma)'''''unpack'''''(equal to)'''''True'''''(comma)'''''delimiter'''''(equal to'')''(within double quotes)'''''colon'''

|-
| 09:22
|Do you have questions on THIS '''Spoken Tutorial?'''.Please visit this site.

|-
| 09:29
| Do you have any general / technical questions? Please visit the forum given in the link.

|-
| 09:37
| The '''FOSSEE '''team coordinates coding of solved examples of popular books.

|-
| 09:43
| We give honorarium and certificates for those who do this. For more details, please visit this site.

|-
| 09:52
| The Spoken Tutorial project is funded by NMEICT, MHRD, Govt. of India

|-
| 09:59
| This is Prathamesh Salunke from IIT Bombay signing off. Thanks for watching.

|}

@@ Line 95: / Line 95: @@
 |-
 | 02:51
-|Now, type: '''cat'''''(space)'''''pendulum'''''(dot)'''''txt ''' and Press '''Enter'''.
+|Now, type: '''cat'''''(space)'''''pendulum'''''(dot)'''''txt ''' and press '''Enter'''.
 |-
@@ Line 185: / Line 185: @@
 |-
 | 06:48
-| Now'' '''''print'''''(within parentheses)'''''L''' and press '''Enter.'''
+| Now, '''print'''''(within parentheses)'''''L''' and press '''Enter.'''
-'''print'''''(within parentheses)'''''T '''''and press '''Enter. '''
+'''print'''''(within parentheses)'''''T ''' and press '''Enter. '''
 |-

@@ Line 90: / Line 90: @@
 |-
 | 02:41
-| We observe that all the numbers end with a period '''‘.’'''. This is because all these numbers are '''floats.'''
+| We observe that all the numbers end with a '''period ‘.’ '''. This is because all these numbers are '''floats.'''
 |-

@@ Line 67: / Line 67: @@
 |-
 | 01:50
-| So, type: '' '''''primes'''''(equal to)'''''loadtxt'''''(within parentheses)(within double quotes)'''''primes'''''(dot)'''''txt''''' and press '''Enter.'''
+| So, type: '''primes'''''(equal to)'''''loadtxt'''''(within parentheses)(within double quotes)'''''primes'''''(dot)'''''txt''' and press '''Enter.'''
 |-
@@ Line 108: / Line 108: @@
 |-
 | 03:23
-| So, type: '''pend'''''(equal to)'''''loadtxt'''''(within parentheses)(within double quotes)'''''pendulum'''''(dot)'''''txt''''' ''and'' press''' Enter.'''''
+| So, type: '''pend'''''(equal to)'''''loadtxt'''''(within parentheses)(within double quotes)'''''pendulum'''''(dot)'''''txt''''' ''and press''' Enter.'''
 |-
@@ Line 187: / Line 187: @@
 | Now'' '''''print'''''(within parentheses)'''''L''' and press '''Enter.'''
-'''print'''''(within parentheses)'''''T '''''and press'' '''Enter. '''
+'''print'''''(within parentheses)'''''T '''''and press '''Enter. '''
 |-

@@ Line 145: / Line 145: @@
 |-
 | 05:01
-| Notice, that''' L''' and''' T''' now contain the first and second columns of data from the '''pendulum.txt '''respectively
+| Notice, that''' L''' and''' T''' now contain the first and second columns of data from the '''pendulum.txt '''respectively.
 |-
@@ Line 175: / Line 175: @@
 |-
 | 05:54
-| So type '''cat''' space '''pendulum'''''(underscore)'''''semicolon'''''(dot)'''''txt''' Press ''' Enter''' We see the two columns separated by a '''semi-colon'''.
+| So, type: '''cat''' space '''pendulum'''''(underscore)'''''semicolon'''''(dot)'''''txt''' and press ''' Enter'''. We see the two columns separated by a semicolon.
 |-
 | 06:12
-| Now, type'' '''''L'''''(comma)'''''T'''''(equal to)'''''loadtxt''''' (within parentheses within double quotes) '''''pendulum'''''(underscore)'''''semicolon''''' (dot)'''''txt'''''(after double quotes comma)'''''unpack'''''(equal to)'''''True'''''(comma)'''''delimiter'''''(equal to)(within double quotes)'''''semicolon'''''.''
+| Now, type: '' '''''L'''''(comma)'''''T'''''(equal to)'''''loadtxt''''' (within parentheses within double quotes) '''''pendulum'''''(underscore)'''''semicolon''''' (dot)'''''txt'''''(after double quotes comma)'''''unpack'''''(equal to)'''''True'''''(comma)'''''delimiter'''''(equal to)(within double quotes)'''''semicolon'''''.''
 And press '''Enter'''.
@@ Line 195: / Line 195: @@
 |-
 | 07:09
-| This brings us to the end of this tutorial. In this tutorial, we have learnt:
+| This brings us to the end of this tutorial. In this tutorial, we have learnt to read data from files using the '''loadtxt()''' command.
-−
-To read data from files using the '''loadtxt()''' command.
 |-
 | 07:20
-| The data can be in
+| The data can be in:
-A single column format Or multiple column format, separated by spaces or other delimiters.
+a single column format or multiple column format, separated by '''space'''s or other '''delimiter'''s.
 |-
 | 07:31
-| Here are some self assessment questions for you to solve
+| Here are some self assessment questions for you to solve.
-'''loadtxt''' can read data only from a file with one column. Is it True or False?
+. '''loadtxt''' can read data only from a file with one column. Is it '''True''' or '''False'''?
-−
-Given a file''' data.txt''' with three columns of data separated by spaces.
 Read it into 3 separate simple sequences.
 |-
 | 07:58
-|Given a file''' data.txt''' with three columns of data separated by '''colon'''. Read it into 3 separate simple sequences.
+|3. Given a file''' data.txt''' with three columns of data separated by '''colon'''. Read it into 3 separate simple sequences.
 |-
 | 08:09
-| Now let us look at the answers, The answer to the first question is False.
+| Now, let us look at the answers. The answer to the first question is '''False'''.
 |-
@@ Line 229: / Line 226: @@
 |-
 | 08:25
-| The answer to the second question is,
+| The answer to the second question is-
-−
 To separate data into three columns, we use the''' loadtxt()''' command as follows:
 |-
 | 08:35
-| '''x('''''equal to)'''''loadtxt'''''(within parentheses and within double quotes'')'''data'''''(dot'')''txt''(after double quotes ''comma'')'''unpack'''(equal to)'''True'''
+| '''x('''''equal to)'''''loadtxt'''''(within parentheses and within double quotes'')'''data'''''(dot'')''txt''(after double quotes ''comma'')'''unpack'''(equal to)'''True'''.
 |-
 | 08:50
-| The answer to the third question is, We read into three separate sequences by using an additional argument of delimiter in the loadtxt command.
+| The answer to the third question is-
 |-
 | 09:03
-| So '''x'''(''equal to'')'''loadtxt'''('' within parentheses, within double quotes'')'''data'''''(dot)'''''txt'''(after double quotes ''comma)'''''unpack'''''(equal to)'''''True'''''(comma)'''''delimiter'''''(equal to'')''(within double quotes)'''''colon'''
+| So, '''x'''(''equal to'')'''loadtxt'''('' within parentheses, within double quotes'')'''data'''''(dot)'''''txt'''(after double quotes ''comma)'''''unpack'''''(equal to)'''''True'''''(comma)'''''delimiter'''''(equal to'')''(within double quotes)'''''colon'''.
 |-
 | 09:22
-|Do you have questions on THIS '''Spoken Tutorial?'''.Please visit this site.
+|Do you have questions on THIS '''Spoken Tutorial?'''. Please visit this site.
 |-
@@ Line 263: / Line 260: @@
 |-
 | 09:52
-| The Spoken Tutorial project is funded by NMEICT, MHRD, Govt. of India
+| The '''Spoken Tutorial''' project is funded by '''NMEICT, MHRD,''' Govt. of India.
 |-
 | 09:59
-| This is Prathamesh Salunke from IIT Bombay signing off. Thanks for watching.
+| This is Prathamesh Salunke from '''IIT Bombay''', signing off. Thanks for watching.
 |}

@@ Line 5: / Line 5: @@
 |-
 | 00:01
-| Hello Friends and Welcome to the spoken tutorial on '''"loading data from files".'''
+| Hello friends and welcome to the '''spoken tutorial''' on '''"loading data from files".'''
 |-
 | 00:07
-| In this tutorial you will learn to,
+| In this tutorial, you will learn to:
-Read data from files, which contain data in:
+read data from files which contain data in:
-Single column format
+single '''column format'''
-Or multiple columns separated by spaces or other delimiters
+or multiple columns separated by '''space'''s or other '''delimiter'''s.
 |-
 | 00:21
-| To record this tutorial, I am using
+| To record this tutorial, I am using:
-'''Ubuntu Linux 14.04''' operating system
+'''Ubuntu Linux 14.04''' operating system,
-'''Python 3.4.3'''
+'''Python 3.4.3''',
-'''IPython 5.1.0'''
+'''IPython 5.1.0'''.
 |-
 | 00:37
-| You should know how to run basic '''Python''' commands on the '''ipython console.'''
+| You should know how to '''run''' basic '''Python''' commands on the '''ipython console.'''
 |-
 | 00:43
-| If not, for relevant Python tutorials, please visit this website [http://spoken-tutorial.org/ http://spoken-tutorial.org]
+| If not, for relevant '''Python tutorials''', please visit this website.
 |-
@@ Line 50: / Line 51: @@
 |-
 | 01:22
-| Type'' '''''cat'''''(space)'''''primes'''''(dot)'''''txt''''' ''
+| Type: '' '''''cat'''''(space)'''''primes'''''(dot)'''''txt''''' ''
 |-
 | 01:29
-| We can use the''' cat''' command to fetch data from the file and display it on the terminal.''press ''Enter
+| We can use the''' cat''' command to fetch data from the file and display it on the terminal. Press '''Enter'''.
 |-
@@ Line 66: / Line 67: @@
 |-
 | 01:50
-| SoType'' '''''primes'''''(equal to)'''''loadtx'''''t(within parentheses)(within double quotes)'''''primes'''''(dot)'''''txt''''' and press''' ''Enter.'''
+| So, type: '' '''''primes'''''(equal to)'''''loadtxt'''''(within parentheses)(within double quotes)'''''primes'''''(dot)'''''txt''''' and press '''Enter.'''
 |-
@@ Line 78: / Line 79: @@
 |-
 | 02:18
-| '''primes''' is now a sequence of prime numbers, that was listed in the file, '''primes.txt'''.
+| '''primes''' is now a sequence of prime numbers that was listed in the file '''primes.txt'''.
 |-
@@ Line 86: / Line 87: @@
 |-
 | 02:29
-| So, type, '''print''' (within '''parentheses''') '''primes''' and press '''Enter'''. We see the sequence printed.
+| So, type: '''print''' (within parentheses) '''primes''' and press '''Enter'''. We see the sequence printed.
 |-
 | 02:41
-| We observe that all the numbers end with a '''period ‘.’ '''. This is because all these numbers are '''floats.'''
+| We observe that all the numbers end with a period ‘.’ . This is because all these numbers are '''floats.'''
 |-
 | 02:51
-|Now Type '''cat'''''(space)'''''pendulum'''''(dot)'''''txt ''' and Press '''Enter'''.
+|Now, type: '''cat'''''(space)'''''pendulum'''''(dot)'''''txt ''' and Press '''Enter'''.
 |-
 | 03:01
-| This file contains two columns of data. This first column contains the length of the '''pendulum'''.
+| This file contains two columns of data. This first column contains the length of the pendulum.
-The second column contains the corresponding '''time period'''.
+The second column contains the corresponding time period.
 |-
@@ Line 107: / Line 108: @@
 |-
 | 03:23
-| So Type '''pend'''''(equal to)'''''loadtxt'''''(within parentheses)(within double quotes)'''''pendulum'''''(dot)'''''txt''''' ''and'' press''' Enter.'''''
+| So, type: '''pend'''''(equal to)'''''loadtxt'''''(within parentheses)(within double quotes)'''''pendulum'''''(dot)'''''txt''''' ''and'' press''' Enter.'''''
 |-
@@ Line 115: / Line 116: @@
 |-
 | 03:47
-| Now print the variable''' pend''' to see what it contains.
+| Now, print the variable''' pend''' to see what it contains.
-Type'' '''''print'''''(within parentheses)'''''pend''''' ''and press''' Enter.'''
+Type: '' '''''print'''''(within parentheses)'''''pend''''' ''and press''' Enter.'''
 |-
 | 04:00
-| Notice that''' '''variable has two sequences containing two columns of the data file.
+| Notice that the variable has two sequences containing two columns of the data file.
 |-
@@ Line 128: / Line 129: @@
 |-
 | 04:16
-| So Type '''L'''(comma)'''T'''''(equal to)'''''loadtxt'''''(within parentheses within double quotes)'''''pendulum'''''(dot)'''''txt'''''(after double quotes comma)'''''unpack'''''(equal to)'''''True''''' ''
+| So, type '''L'''(comma)'''T'''''(equal to)'''''loadtxt'''''(within parentheses within double quotes)'''''pendulum'''''(dot)'''''txt'''''(after double quotes comma)'''''unpack'''''(equal to)'''''True''''' ''
-And press '''Enter.'''
+and press '''Enter.'''
 |-
 | 04:42
-| Now print the variables''' L''' and''' T''', to see what they contain.
+| Now print the variables''' L''' and''' T''' to see what they contain.
 |-
 | 04:47
-| Type'' '''''print'''''(within parentheses)'''''L''''' ''and press''' Enter'''
+| Type: '' '''''print'''''(within parentheses)'''''L''''' ''and press''' Enter'''.
-Type'' '''''print'''''(within parentheses)'''''T '''and press''' Enter'''
+Type: '' '''''print'''''(within parentheses)'''''T '''and press''' Enter'''.
 |-

@@ Line 94: / Line 94: @@
 |-
 | 02:51
-|Now Type '''cat'''''(space)'''''pendulum'''''(dot)'''''txt ''' Press '''Enter'''.
+|Now Type '''cat'''''(space)'''''pendulum'''''(dot)'''''txt ''' and Press '''Enter'''.
 |-
@@ Line 183: / Line 183: @@
 |-
-| 06:49
+| 06:48
 | Now'' '''''print'''''(within parentheses)'''''L''' and press '''Enter.'''
@@ Line 208: / Line 208: @@
 | Here are some self assessment questions for you to solve
-. '''loadtxt''' can read data only from a file with one column. Is it True or False?
+'''loadtxt''' can read data only from a file with one column. Is it True or False?
-.  Given a file''' data.txt''' with three columns of data separated by spaces.
+Given a file''' data.txt''' with three columns of data separated by spaces.
 Read it into 3 separate simple sequences.
@@ Line 216: / Line 216: @@
 |-
 | 07:58
-|1. Given a file''' data.txt''' with three columns of data separated by '''colon'''. Read it into 3 separate simple sequences.
+|Given a file''' data.txt''' with three columns of data separated by '''colon'''. Read it into 3 separate simple sequences.
 |-
@@ Line 242: / Line 242: @@
 |-
 | 09:03
-| So'''x'''(''equal to'')'''loadtxt'''('' within parentheses, within double quotes'')'''data'''''(dot)'''''txt'''(after double quotes ''comma)'''''unpack'''''(equal to)'''''True'''''(comma)'''''delimiter'''''(equal to'')''(within double quotes)'''''colon'''
+| So '''x'''(''equal to'')'''loadtxt'''('' within parentheses, within double quotes'')'''data'''''(dot)'''''txt'''(after double quotes ''comma)'''''unpack'''''(equal to)'''''True'''''(comma)'''''delimiter'''''(equal to'')''(within double quotes)'''''colon'''
 |-

@@ Line 61: / Line 61: @@
 |-
-| 01:42
+| 01:43
 | Now we can use the '''loadtxt()''' command to store this list into the variable''' primes'''.