Python's Big God Growth path: the first learning record

First, the history of Python

II, Python2 or 3

The blogger chose Python3.

Download Python www.python.org from official website

Windows installs python3.5, python2.7. You may need to adjust the path after installation.

"Right-click Computer"-"Properties"-"Advanced system Settings"-"Advanced"-"Environment variable"-"in the second content box to find the variable named path of a row, double-click"-"Python installation directory appended to the variable value, with;    such as: the original value; C:\python27, remember that there's a semicolon in front

　　

Third, the first code:

"Hello word", of course.

print "Hello word"

Iv. variables

Variable names can only be any combination of letters, numbers, or underscores

The first character of a variable name cannot be a number

The following keywords cannot be declared as variable names
[' and ', ' as ', ' assert ', ' Break ', ' class ', ' Continue ', ' Def ', ' del ', ' elif ', ' Else ', ' except ', ' exec ', ' finally ', ' for ', ' F ' Rom ', ' Global ', ' if ', ' import ', ' in ', ' was ', ' lambda ', ' not ', ' or ', ' pass ', ' print ', ' raise ', ' return ', ' try ', ' while ', ' WI Th ', ' yield ']

Example:

Name = "Tom"

Five, the Code

Python3 has the perfect support for UTF-8, and all of the bloggers ' Python uses Utf8,

UTF8: Chinese characters 3bytes, English 1 bytes

Vi. notes

Three quotation marks enable multiple lines of comment. #单行注释

7, the first knowledge module

You can import third-party modules, custom modules, and so on using import.

View the Import module catalog

1 Import SYS 2 Print (Sys.path)

View Code

8. Input

Input,python2 in the Python3 raw_input

>>> username = input ("Your name:") your name:otcsnow>>> print (username) otcsnow

　　

9: Conditional statement, loop statement

If...else, If...elif...else,

While

For

A = 3if a > 3:    print ("big") Elif a<3: print (    "less") Else:    print ("equal") while a <:    print (" While Loop ", a)    a + = 1for i in range (5,a,2):    print (" To loop, ", i) equal (' While loop ', 3) (' While Loop ', 4) Oop ', 5) (' While Loop ', ' 6 ') (' While Loop ', ' 7 ') (' While Loop ', ' 8 ') (' When Loop ', ' 9 ') (' for Loops ', ' 5 ') (' For Loop, ', 7 ') (' For Loop, ', 9)

　　

Thanks.

Python's Big God Growth path: the first learning record