Python CheatSheet

python_cheatsheet.txt

1. Main Function
  if __name__ == "__main__":

2. CLI arg count
  len(sys.argv)

2.1 CLI args
  sys.arg[0]
  sys.arg[1]

3. Basic

3.1 Variable
  var = 15
  g_var = 10
  def func1():
    global g_var
    print str(g_var)

3.2 Shell cmd call
  import os
  os.system("cmd")

3.3 File Operations
  f = open("test.txt",'w')
  f.write("This file\n\n")
  f.close()
4. Function
  def func1(arg1, arg2):
    ...

4.1 Get Function name within that function
  import inspect
  def foo():
    print(inspect.stack()[0][3])
    
5. Class with constructor and members
  class ABC(object):
    def __init__(self, arg1, arg2): # Constructor
      self.a1 = 10    #Member Variable
      ...
    def mem_func1(self): #Member function
      ...
    def mem_func2(self):
      ...
    def __del__(self): # Destructor
      ...
5.1 Releasing object
   obj = None # Assigning None to any object will free it