python basics

module

it is just a python file which may hold functions, classes, methods, variables. for import we can use import as show below.

import sys #to import full module
from datetime import date #to import submodule
from time import time #to import specific function, it can then be called directly

Note: functions are not bound to any class whereas methods are bound to class

global variable

print(__name__) #output: __main__
#if we have another module (different python file) to print __name__ variable
#import the other module in main python file 
#then the other module will print __module__ and main will print __main__

one way to use it:

if __name__ == "__main__":
  print("invoked when directly called")
else:
  print("invoked when imported as module in other file")

dymanic typed

It is dynamically typed language, means data types are inferred.

var = 1
print(var)

lambda functions

inline function, example for square we can use like below

x = lambda a : a * a
print(x(2))