Python/C3/Loops/English-timed - Revision history

PoojaMoolya at 06:55, 27 March 2017

2017-03-27T06:55:37Z

PoojaMoolya at 11:19, 20 February 2017

2017-02-20T11:19:13Z

Gaurav at 09:40, 10 July 2014

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Kavita salve at 11:21, 7 August 2013

2013-08-07T11:21:12Z

Kavita salve at 11:18, 7 August 2013

2013-08-07T11:18:22Z

Sneha at 09:49, 22 March 2013

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Sneha at 09:35, 22 March 2013

2013-03-22T09:35:56Z

Minal: Created page with '{| border=1 !Visual Cue !Narration |- | 0:01 | Hello Friends and Welcome to the tutorial on 'loops' in Python. |- | 0:05 | At the end of this tutorial, you will be able to, # u…'

2013-01-02T12:06:13Z

Created page with '{| border=1 !Visual Cue !Narration |- | 0:01 | Hello Friends and Welcome to the tutorial on 'loops' in Python. |- | 0:05 | At the end of this tutorial, you will be able to, # u…'

New page

{| border=1
!Visual Cue
!Narration
|-
| 0:01
| Hello Friends and Welcome to the tutorial on 'loops' in Python.

|-
| 0:05
| At the end of this tutorial, you will be able to,

# use the <tt>for</tt> loop
# use the <tt>while</tt> loop
# Use <tt>break</tt>, <tt>continue</tt> and <tt>pass</tt> statements to play around with loops.

|-
| 0:17
| Before beginning this tutorial,we would suggest you to complete the tutorial on "Getting started with for" and "Conditionals".

|-
| 0:24
| Let us start our ipython interpreter.

|-
|0:28
|Type ipython in the terminal

|-
| 0:32
| We shall first begin with the <tt>while</tt> loop.

|-
| 0:34
| The <tt>while</tt> loop is used for repeated execution as long as a condition is <tt>True</tt>.

|-
| 0:39
| Let us print the squares of all the odd numbers less than 10, using the <tt>while</tt> loop.

|-
|0:45
|Type i = 1

while i less than 10 colon
print i multiply by i
i += 2

|-
| 1:19
| This loop prints the squares of the odd numbers below 10.

|-
| 1:23
| The <tt>while</tt> loop, repeatedly checks if the condition is true and executes the block of code within the loop, if it is.

|-
| 1:30
| As with any other block in Python, the code within the <tt>while</tt> block is indented to the right by 4 spaces.

|-
| 1:41
| Pause the video here, try out the following exercise and resume the video.

|-
| 1:48
| '''Write a <tt>while</tt> loop to print the squares of all the even''' numbers below 10.

|-
| 1:55
| Switch to the terminal for solution.

|-
|1:58
|Type i = 2

while i less than 10 colon
print i multiply by i
i += 2

|-
| 2:27
| Let us now solve the same problem of printing the squares of all odd numbers less than 10, using the <tt>for</tt> loop.

|-
| 2:34
| As we know, the <tt>for</tt> loop iterates over a list or any other sequential data type.

|-
| 2:40
| So, we use the <tt>range</tt> function to get a list of odd numbers below 10, and then iterate over it and print the required stuff.

|-
|2:48
|Type for n in range within bracket 1 comma 10 comma 2 colon
print n multiply by n

|-
| 3:07
| We can see that we got the same output as before.

|-
| 3:10
| Note that the lines of code are less.

|-
| 3:13
| Pause the video here, try out the following exercise and resume the video.

|-
| 3:19
| '''Write a <tt>for</tt> loop to print the squares of all the even''' numbers below 10.

|-
| 3:24
| Switch to the terminal for solution.

|-
| 3:26
|Type for n in range within bracket 2 comma 10 comma 2 colon
print n multiply by n

|-
| 3:46
| Let us now look at how to use the keywords, <tt>pass</tt>, <tt>break</tt> and <tt>continue</tt>.

|-
| 3:52
| As we already know, <tt>pass</tt> is just a syntactic filler.

|-
| 3:56
| It is used for the sake of completion of blocks, that do not have any code within them.

|-
|4:02
|Type for n in range within bracket 2 comma 10 comma 2 colon

pass

And Enter.

|-
| 4:20
| <tt>break</tt> is used to break out of the innermost loop.

|-
| 4:24
| The <tt>while</tt> loop to print the squares of all the odd numbers below 10, can be modified using the <tt>break</tt> statement, as follows

|-
|4:31
|Type = 1

while True colon
print i multiply by i
i += 2
if i is less than 10 colon
break
|-
|5:10
|So we got a syntax error because 'if' is not inside the while loop
So type while True colon
print i multiply by i
i += 2
if i less than 10 colon
break
Make sure that 'if' is inside the while loop.

|-
| 5:42
| <tt>continue</tt> is used to skip execution of the rest of the loop on this iteration and continue to the end of this iteration.

|-
| 5:50
| So, we wish to print the squares of all the odd numbers below 10, which are not multiples of 3, we would modify the <tt>for</tt> loop as follows.

|-
|6:03
|So, in terminal, Type for n in range within bracket 1 comma 10 comma 2 colon

if n modulo 3 == 0 colon
continue
print n multiply by n

|-
| 6:36
| Now Pause the video here, try out the following exercise and resume the video.

|-
| 6:41
| Using the <tt>continue</tt> keyword modify the <tt>for</tt> loop, with the <tt>range(2 comma 10 comma 2)</tt>, to print the squares of even numbers below 10, which are multiples of 4.

|-
| 6:53
| (Do not modify the range function call.)

|-
| 6:59
| Now Switch to the terminal for solution.

|-
|7:02
|Type for n in range within bracket 2 comma 10 comma 2 colon
if n modulo 4 colon
continue
print n multiply by n

|-
| 7:30
| This brings us to the end of this tutorial.

|-
| 7:33
| In this tutorial, we have learnt to, 1. Iterate over a sequence using ``for'' and ``while'' loops.

|-
| 7:38
| 2. Break out of loops using ``break'' statement.

|-
| 7:42
| 3. Skip iterations using ``continue'' statement.

|-
| 7:45
| 4. Use the ``pass'' statement in a loop.

|-
| 7:49
| Here are some self assessment questions for you to solve

|-
| 7:52
| 1. Given <tt>range(1 comma 4)</tt><nowiki>; Write a code to print only the number 1.</nowiki>

|-
| 8:01
| 2.Second one is, Which statement do you use to skip iterations. - break - pass - continue

|-
| 8:10
| And the answers,

|-
| 8:12
| 1. First one, We can use the break statement in a for loop as,
''' colon colon'''

|-
| 8:21
| '''for i in range within bracket 1 comma 4 colon'''

|-
| 8:27
| Then print i break

|-
| 8:30
| And second one, In order to skip iterations,we make use of the <tt>continue</tt> statement.

|-
| 8:37
| Hope you have enjoyed this tutorial and found it useful.

|}

@@ Line 12: / Line 12: @@
 # use the  '''for''' loop
 # use the '''while''' loop
-# Use '''break''', continue and pass statements to play around with loops.
+# Use '''break''', '''continue''' and '''pass''' statements to play around with loops.
 |-

@@ Line 10: / Line 10: @@
 | At the end of this tutorial, you will be able to,
-# use the  for loop
+# use the  '''for''' loop
-# use the while loop
+# use the '''while''' loop
-# Use break, continue and pass statements to play around with loops.
+# Use '''break''', continue and pass statements to play around with loops.
 |-

@@ Line 140: / Line 140: @@
 |05:10
 |So we got a syntax error because 'if' is not inside the while loop
 So type while True colon
-print i multiply by i
+So type while True colon print i multiply by i, i += 2
 i += 2
-if i less than 10 colon
+if i less than 10 colon break Make sure that 'if' is inside the while loop.
 break
 Make sure that 'if' is inside the while loop.
 |-
@@ Line 181: / Line 179: @@
 |07:02
 |Type for n in range within bracket 2 comma 10 comma 2 colon
 if n modulo 4 colon
-continue
+if n modulo 4 colon continue print n multiply by n
 print n multiply by n
 |-
@@ Line 195: / Line 192: @@
 |-
 |  07:38
-|Break out of loops using ``break'' statement.
+|Break out of loops using ''break'' statement.
 |-
 |  07:42
-|Skip iterations using ``continue'' statement.
+|Skip iterations using ''continue'' statement.
 |-
 |  07:45
-|Use the ``pass'' statement in a loop.
+|Use the ''pass'' statement in a loop.
 |-

@@ Line 113: / Line 113: @@
 |-
 | 3:24
-| Switch to the terminal for solution.
+| Switch to the terminal
 |-
@@ Line 126: / Line 126: @@
 |-
 |  3:52
-| As we already know, pass</tt > is just a syntactic filler.
+| As we already know, pass is just a syntactic filler.
 |-
@@ Line 173: / Line 173: @@
 |-
 |  5:50
-| So, we wish to print the squares of all the odd numbers below 10, which are not multiples of 3, we would modify the <tt>for</tt> loop as follows.
+| So, we wish to print the squares of all the odd numbers below 10, which are not multiples of 3, we would modify the    for  loop as follows.
 |-

@@ Line 10: / Line 10: @@
 | At the end of this tutorial, you will be able to,
-# use the <tt>for</tt> loop
+# use the  for loop
-# use the <tt>while</tt> loop
+# use the while loop
-# Use <tt>break</tt>, <tt>continue</tt> and <tt>pass</tt> statements to play around with loops.
+# Use break, continue and pass statements to play around with loops.
 |-
@@ Line 28: / Line 28: @@
 |-
 |  0:32
-| We shall first begin with the <tt>while</tt> loop.
+| We shall first begin with the while  loop.
 |-
 |  0:34
-| The <tt>while</tt> loop is used for repeated execution as long as a condition is <tt>True</tt>.
+| The while  loop is used for repeated execution as long as a condition is   True .
 |-
 |  0:39
-| Let us print the squares of all the odd numbers less than 10, using the <tt>while</tt> loop.
+| Let us print the squares of all the odd numbers less than 10, using the  while  loop.
 |-
@@ Line 52: / Line 52: @@
 |-
 |  1:23
-| The <tt>while</tt> loop, repeatedly checks if the condition is true and executes the block of code within the loop, if it is.
+| The while  loop, repeatedly checks if the condition is true and executes the block of code within the loop, if it is.
 |-
 |  1:30
-| As with any other block in Python, the code within the <tt>while</tt> block is indented to the right by 4 spaces.
+| As with any other block in Python, the code within the  while  block is indented to the right by 4 spaces.
 |-
@@ Line 64: / Line 64: @@
 |-
 | 1:48
-| '''Write a <tt>while</tt> loop to print the squares of all the even''' numbers below 10.
+| '''Write a  while  loop to print the squares of all the even''' numbers below 10.
 |-
@@ Line 80: / Line 80: @@
 |-
 | 2:27
-| Let us now solve the same problem of printing the squares of all odd numbers less than 10, using the <tt>for</tt> loop.
+| Let us now solve the same problem of printing the squares of all odd numbers less than 10, using the  for  loop.
 |-
 |  2:34
-| As we know, the <tt>for</tt> loop iterates over a list or any other sequential data type.
+| As we know, the   for  loop iterates over a list or any other sequential data type.
 |-
 |  2:40
-| So, we use the <tt>range</tt> function to get a list of odd numbers below 10, and then iterate over it and print the required stuff.
+| So, we use the range  function to get a list of odd numbers below 10, and then iterate over it and print the required stuff.
 |-
@@ Line 109: / Line 109: @@
 |-
 | 3:19
-| '''Write a <tt>for</tt> loop to print the squares of all the even''' numbers below 10.
+| '''Write a  for loop to print the squares of all the even''' numbers below 10.
 |-
@@ Line 122: / Line 122: @@
 |-
 | 3:46
-| Let us now look at how to use the keywords, <tt>pass</tt>, <tt>break</tt> and <tt>continue</tt>.
+| Let us now look at how to use the keywords,  pass ,  break  and  continue .
 |-
 |  3:52
-| As we already know, <tt>pass</tt> is just a syntactic filler.
+| As we already know, pass</tt > is just a syntactic filler.
 |-
@@ Line 142: / Line 142: @@
 |-
 | 4:20
-| <tt>break</tt> is used to break out of the innermost loop.
+|  break  is used to break out of the innermost loop.
 |-
 |  4:24
-| The <tt>while</tt> loop to print the squares of all the odd numbers below 10, can be modified using the <tt>break</tt> statement, as follows
+| The   while loop to print the squares of all the odd numbers below 10, can be modified using the break  statement, as follows
 |-
@@ Line 169: / Line 169: @@
 |-
 | 5:42
-| <tt>continue</tt> is used to skip execution of the rest of the loop on this iteration and continue to the end of this iteration.
+|  continue  is used to skip execution of the rest of the loop on this iteration and continue to the end of this iteration.
 |-
@@ Line 189: / Line 189: @@
 |-
 | 6:41
-| Using the <tt>continue</tt> keyword modify the <tt>for</tt> loop, with the <tt>range(2 comma 10 comma 2)</tt>, to print the squares of even numbers below 10, which are multiples of 4.
+| Using the  continue keyword modify the  for  loop, with the range(2 comma 10 comma 2) , to print the squares of even numbers below 10, which are multiples of 4.
 |-
@@ Line 232: / Line 232: @@
 |-
 |  7:52
-| 1. Given <tt>range(1 comma 4)</tt><nowiki>; Write a code to print only the number 1.</nowiki>
+| 1. Given  range(1 comma 4) ; Write a code to print only the number 1.
 |-
@@ Line 257: / Line 257: @@
 |-
 |  8:30
-|  And second one, In order to skip iterations,we make use of the <tt>continue</tt> statement.
+|  And second one, In order to skip iterations,we make use of the continue  statement.
 |-