Difference between revisions of "Python 3.4.3"

From Script | Spoken-Tutorial
Jump to: navigation, search
(→‎Accessing parts of arrays)
(→‎Matrices)
Line 252: Line 252:
 
#Access only the odd rows and columns of an array
 
#Access only the odd rows and columns of an array
 
#Examples to demonstrate all the manipulations of arrays
 
#Examples to demonstrate all the manipulations of arrays
 +
 +
=== Image manipulation using Arrays ===
 +
#Read images into arrays
 +
#How to access parts of an array?
 +
#imread command
 +
#imshow command
 +
#show command
 +
#How to check the dimensions of an array?
 +
#Example to access parts of an image
 +
#How to stride over an array?
 +
#Example to access an RGB image
 +
#Slice an image of different dimension
  
 
=== Matrices ===
 
=== Matrices ===

Revision as of 16:14, 9 October 2020

IIT Bombay is leading the effort to popularise Python for Scientific Computing in India. This is part of the Free and Open source Software for Science and Engineering Education (http://fossee.in) project, supported by the National Mission on Education through ICT of MHRD.

IIT Bombay is using Spoken Tutorials (http://spoken-tutorial.org) to create learning material for FOSS. This is the main page for the organisation of the scripts required for Standard two day workshop we conduct on "Python for Scientific Computing" spoken tutorials.

Learners: UG/PG CSE/IT/CS students and CBSE high school students

Note: Each numbered topic corresponds to a single spoken tutorial. Each bulleted point corresponds to a command or topic that must be covered in the given spoken tutorial.

Module 1: Basic Plotting

Getting started with ipython

  1. Use Python 3.5.2
  2. Use Ipython version 5.1.0
  3. IPython is an enhanced interactive Python interpreter.
  4. Invoke the IPython interpreter
  5. Quit the IPython interpreter
  6. Navigate the IPython session history
  7. Use tab-completion to work faster.
  8. See the documentation of functions using question mark.
  9. Interrupt commands using Ctrl + C when we make an error.
  10. round command

Using the plot command interactively

  1. Use Python 3.4.3
  2. Use Ipython version 5.1.0
  3. Start IPython with pylab.
  4. ImportError if matplotlib is not installed
  5. clf() function
  6. Use the linspace function to create equally spaced points in a region.
  7. Find the length of sequences using len function.
  8. Plot mathematical functions using plot.
  9. Clear drawing area using clf.
  10. Usage of buttons in the UI of the plot window such as - save, zoom, move axis, back and forward and Home

Embellishing a plot

  1. Use Python 3.4.3
  2. Use Ipython version 5.1.0
  3. Modify the attributes of a plot
  4. Pass additional keyword arguments to plot command
  5. Add title to a plot using 'title' command.
  6. Incorporate LaTeX style formatting by adding a $ sign before and after the string.
  7. Label x and y axes using xlabel() and ylabel() commands.
  8. Add annotations to a plot using annotate() command.
  9. Get the limits of axes using xlim() and ylim() commands.
  10. Set the limits of axes using xlim() and ylim() commands.

Saving plots

  1. Use Python 3.4.3
  2. Use Ipython version 5.1.0
  3. Save plots using the savefig() function.
  4. Save the plots in different formats like
    • pdf
    • ps
    • png
    • svg
    • eps

Multiple plots

  1. Use Python 3.4.3
  2. Use IPython 5.1.0
  3. Draw multiple plots which are overlaid.
  4. Operations on individual plots.
  5. Use the figure command.
  6. Distinguish between multiple overlaid plots.
  7. Use the legend command.
  8. Serial number of the plot to select corresponding plot.
  9. Switch between the plots
  10. Saving individual plots.

Subplots

  1. Use Python 3.4.3
  2. Use IPython 5.1.0
  3. Creating subplots
  4. Switching between subplots.
  5. Subplot command
  6. Passing arguments to subplot command.
  7. First argument is the number of rows of subplots.
  8. Second argument is the number of columns of subplots
  9. Third argument specifies the serial number for subplot.

Additional features of IPython

  1. Use Python 3.4.3
  2. Use IPython 5.1.0
  3. Retrieve the history using  %history command.
  4. View only a part of history by passing argument to %history command.
  5. Pass arguments to %history to get particular lines of code
  6. Save the required lines of code in required order using '%save' command.
  7. Use '%run -i' command to run a saved script.

Module 2: Plotting Experimental Data

loading data from files

  1. load data from file
  2. single column
  3. multiple columns separated by delimiter
  4. cat command
  5. loadtxt()
  6. columns separated by spaces
  7. columns separated by semi-colon
  8. unpack argument
  9. delimiter argument
  10. three columns of data

Plotting the data

  1. plotting data
  2. list
  3. list element-wise squaring
  4. plot data points
  5. clear plots
  6. errorbar function
  7. dots or filled circles in plot
  8. plot with red pluses
  9. explore documentation in ipython
  10. plot with errorbars
  11. using format argument

Other types of plots

  1. scatter plot
  2. scatter function
  3. scatter plot with various arguments
  4. logarithmic plot
  5. loglog function
  6. cat command
  7. loadtxt function
  8. unpack parameter of loadtxt
  9. linspace
  10. scatter versus plot

Plotting charts

  1. Use Python 3.4.3
  2. Use IPython 5.1.0
  3. To produce scatter plot
  4. Plot a pie chart using pie() function
  5. Plot a bar chart using bar() function
  6. Access the matplotlib online help
  7. Charts with line hatching

Module 4: Handling Large Data Files

Getting started with lists

  1. What is a list?
    • Define List
    • List index
  2. Create:
    • List with elements
    • Empty list
    • List within a list
  3. Find out the list length using len function
    • Access elements using their index numbers
    • Append elements to list using the function append
    • Delete element from list using the del and remove function

Getting started with for

  1. For loop syntax
  2. Example to use For loop
  3. Indentation in for loop
  4. Create blocks in python using for
  5. Iterate over a list using for loop
  6. How to get out of the block
  7. use of Range() function
  8. Range function in for loop
  9. How to use Python interpreter
  10. IPython interpreter to specify blocks

Getting started with strings

  1. What are strings?
  2. How are strings denoted in Python?
  3. String concatenation
  4. Multiply a string with an integer
  5. Accessing individual elements of a string
  6. Accessing elements of a string using negative indices
  7. Split() function
  8. Join() function
  9. Define a string in different ways
  10. Print a string repeatedly

Getting started with files

  1. Open a file
  2. Open() function
  3. Different Modes of opening a file
  4. Read() method
  5. Read the content of the file line by line
  6. Read the entire content of the file
  7. Append the lines of a file to a list
  8. Close a file
  9. Demonstration using a txt file
  10. Splitlines() method

Parsing data

  1. What is Parsing data?
  2. split function and its syntax
  3. What is string tokenizing?
  4. How to split a string on whitespace?
  5. split function with argument
  6. strip function and example
  7. Converting string into floats and integers
  8. Example to read a huge .txt file line by line and parse each record
  9. Perform computations on the .txt file
  10. Execute the file using %run command

Statistics

  1. Statistical operations in Python
  2. Installation of Numpy for mathematical and logical operations
  3. Installation of pip to install python libraries
  4. loadtxt() function with example
  5. Getting the shape of an array
  6. Getting the sum of a column in an array
  7. How to calculate mean?
  8. Calculate mean across each of the axis of the array
  9. How to calculate median?
  10. How to calculate standard deviation?

Module 5: Arrays and Matrices

Getting started with arrays

  1. Overview of array
  2. Usage of numpy library
  3. How to create arrays
  4. How to create two dimensional array
  5. arange() method
  6. reshape() method
  7. How to find the shape of an array?
  8. Create a new array with elements of different datatypes
  9. Identity matrix
  10. Zeros method

Accessing parts of arrays

  1. Create a one-dimensional array
  2. Create a two-dimensional array
  3. Accessing individual elements of an array
  4. How to change the value of an array
  5. How to change more than one elements at a time
  6. Negative indexing of arrays
  7. Slicing of an array
  8. Striding of an array
  9. Access only the odd rows and columns of an array
  10. Examples to demonstrate all the manipulations of arrays

Image manipulation using Arrays

  1. Read images into arrays
  2. How to access parts of an array?
  3. imread command
  4. imshow command
  5. show command
  6. How to check the dimensions of an array?
  7. Example to access parts of an image
  8. How to stride over an array?
  9. Example to access an RGB image
  10. Slice an image of different dimension

Matrices

  • creating matrices
    • direct data
    • list conversion
    • builtins - identitiy, zeros,
  • matrix operations
    • + - * /
    • dot
    • inv
    • det
    • eig
    • norm
    • svd

Least square fit

  • show pendulum
    • use loadtxt
  • lstsq

Module 6: Python Language: Basics

Basic datatypes & operators

  • int
    • L, long
  • float
    • repr, str
  • complex
  • boolean
  • conversion functions
  • sequence datatypes & mutability
    • list available sequence datatypes
      • string
      • list
      • tuple
    • mutability
    • conversion
    • common stuff
      • len
      • in
      • max, min, sum, sorted, reversed
      • accessing individual elements
      • slicing, striding

I/O

Input Output in Python

Conditionals

  • if, elif, else
  • pass

Loops

  • while
  • for
  • pass, break, continue

Module 7: Python Language: Datastructures

Manipulating lists

  • concatenation
  • slicing
  • striding
  • .sort
  • sorted
  • .reverse
  • reversed

Manipulating strings

  • upper, lower,
  • replace
  • slicing
  • [::-1]
  • reversed
  • palindrome check

Getting started with tuples

  • immutability
  • tuple packing, unpacking
    • a, b = b, a
  • accessing individual elements
  • slicing, striding

Dictionaries

  • empty
  • filled
  • accessing via keys
  • .values(), .keys()
  • in
  • iteration

Sets

Sets

About sets in python

Module 8: Python Language: Advanced

Getting started with functions

  • defining function
  • arguments
  • docstrings
  • return values
    • can return multiple values
  • code reading exercises

Advanced features of functions

  • default arguments
  • keyword arguments
  • built-in functions show off

Using python modules

  • scipy
  • pylab
  • sys

Writing python scripts

  • import

Testing and debugging

Testing and debugging

Handling Errors and Exceptions

  • ValueError exception
  • ZeroDivisionError exception
  • try except clause in Python
  • debugging

Contributors and Content Editors

Nancyvarkey, Nirmala Venkat, PoojaMoolya, Trupti

Retrieved from "https://script.spoken-tutorial.org/index.php?title=Python_3.4.3&oldid=53978"