python

python

1. features

   • object oriented
   • case sensitive
   • dynamic sematics
   • python 2.7

2. invention

   • Guido van Rossum on December 1989

3. I/O

   • print()
   • raw_input()

4. Datatypes

   • Numbers
     • integers
       • octal(0)
       • hexadecimal(0x)
     • floating point
       • decimals 10 values
         • depends on version
     • complex numbers
       • x=iy
     • misc
       • if()-checks object of particular class
       • type()-check class variable
       • del statement-reference to a variable
   • String
     • starts numbering at 0 single quotes ('') double quotes("")
   • List
     • ordered sequence of elements with different datatype
     • list1=[1,a,hi,2.5,.. ]
     • element size can be updated
   • Set
     • unordered collection of elements different types and elements cannot be changed
     • set={1,3}
     • predefined functions
       • add()-adds item to set
       • update()-updates items to set
       • remove()-removes item from set
   • Tuple
     • ordered sequence of elements with different data type
     • list=(1,a,hi,2.3..)
     • element size cannot be changed
   • Dictionary
     • dic={'name':'janu','age':'30'}

5. functions

   • def function_name():
   • function arguements
     • def fn_name(arg1,rg2):
     • def fn_na(key=value):
     • def fn_na(arg1,arg=2):
     • def fn_na(*args):
   • from..import
     • >>from example import add
       • invokes add function from example prgm