introducePython
Resource Code: ‘/anaconda3/lib/python3.6/timeit.py’
Numbers,Strings,Variables
- In python ,everything :boolean, integer, float, even large data structure, function and programs os implements as a object.
2.how to change a str:
For example:
name=‘Henny’
name.replace(‘H’,‘P’)
Out[17]: ‘Penny’
‘P’+name[1:]
Out[18]: ‘Penny’
3.Slice[startstep]:
For example:
letters=‘abcdefghijklmnopqrstuvwxyz’
letters[:]
Out[20]: ‘abcdefghijklmnopqrstuvwxyz’
letters[20:]
Out[21]: ‘uvwxyz’
letters[10:]
Out[22]: ‘klmnopqrstuvwxyz’
letters[12:15]
Out[23]: ‘mno’
#doesnt include the lasted offsets
#the three last characters as below:
letters[-3:]
Out[26]: ‘xyz’
letters[18:-3]
Out[27]: ‘stuvw’
letters[-6:-2]
Out[28]: ‘uvwx’
letters[::7]
Out[29]: ‘ahov’
letters[4:20:3]
Out[30]: ‘ehknqt’
letters[19::4]
Out[31]: ‘tx’
lette