Python learn
with examples
Suggested approach is to learn examples in the given sequence. Also discussed are few fundamentals.
Few fundamentals to know before we code in Python:
- Import system modules like sys, os, string, time etc. before you start writing code. Importing ‘sys’ and ‘os’ covers majority of the Python core constructs.
- Indenting or tab is most important in Python and should be strictly maintained.
- Reserved word ‘def’ is used for defining a function in Python.
- Reserved word ‘class’ is used to group functions.
- Command line arguments lists as string with ‘sys.argv’.
Following list of programs
are discussed in this sec:
¶ File Operations:
- Open and read file from within the python program as a single string. Command line arguments lists as string with ‘sys.argv’.
- Use of glob module in Python code . Read file using classes, global variables and functions. Program to open and write file.
- Specify files to be written from the command line. File writes using classes and global variables
¶ Program to read file, filter text, conversion to HEX, conversion from Hexadecimal to Signed Magnitude
. Steps for conditional statements, converting string to hexadecimal
value, strip of white space at end, converting 12 bit hexadecimal values to 12 bit signed values.
¶ Advanced python code to cover UNIX shell commands, read lines from a text file, ‘sysargv’ command line operations, use of class and multiple functions.
¶ Write a program to generate diamond pattern.
¶ Implement Python function calls to different classes.
¶ Python read binary files, use of struct.unpack
c.
¶ Python error’s with complete code examples:-
- TypeError: __init__() takes exactly 2 arguments (1 given),
- TypeError: 'str' object is not callable, TypeError: not all arguments converted during string formatting,
- AttributeError: ** instance has no attribute **
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with links below.