2017年4月16日 (日) 20:13的版本

1 Quick Start

Install python2.7 from https://www.python.org/downloads/

Install pip:

$ curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
$ sudo python get-pip.py

2 Basics

2.1 Numbers

Python 2.7.9 (default, Mar  1 2015, 12:57:24) 
>>> a = 3.23
>>> b = 4
>>> c = 52.3E-4
>>> print a, b, c
3.23 4 0.00523

2.2 Strings

#!/usr/bin/python

str_1 = 'Jack Tan'
str_2 = "Ga Xiao Duo"
str_3 = '''This is a multi-line string. first line.
second line'''

# using the startswith method of the string object
if str_1.startswith('Ja'):
    print("Yes, str_1 start with 'Ja'")

if 'a' in str_1:
    print('Yes, str_1 contains the string "a"')

substr = 'ac'
if str_1.find(substr) != -1:
    print('Yes, str_1 contains the string "{0}"'.format(substr))
    print('Yes, {0} contains the string "{1}"'.format('str_1', substr))
    print('Yes, {} contains the string "{}"'.format('str_1', substr))
    # using the format method of the string object

deli = '_*_'
mylist = ['Brazil', 'Russia', 'India', 'China']

# using the join method of the string object
print(deli.join(mylist))

Output:

Yes, name start with 'Ja'
Yes, name contains the string "a"
Yes, name contains the string "ac"
Brazil_*_Russia_*_India_*_China

Once your have created a string, you cannot change it

2.3 Variable

Python refers to anything used in a program as an object.

Do not need type declaration of variable in python

Python 2.7.9 (default, Mar  1 2015, 12:57:24) 
>>> a = 3.1415
>>> b = 100000
>>> c = 'Jack Tan'
>>> d = ['x1', 'x2']
>>> print a, b, c, d
3.1415 100000 Jack Tan ['x1', 'x2']

3 Operators

4 Control Flow

5 Functions

6 Data Structures

7 Exceptions

8 Modules

9 Object Oriented

10 Resource

• Online Python: http://www.compileonline.com/execute_python_online.php

• Python Quick Start: http://www.tutorialspoint.com/python/python_lists.htm