Python base 8 (expressions and statements)

One,print and import information

Print ' Age : ',   # #  Print multiple expressions separated by commas age:22

 Import somemodule             #  importing functions from module imports   math as Foobar>>> FOOBAR.SQRT (4)2.0 from import *      #  Import all features from a given module

Second, assign the value

1. Sequence unpacking: The sequence of multiple values is untied

>>> values = 1,2,3>>> values (1, 2, 3)>>> x,y,z=values>> > x1>>> x,y=y,x       #  swapping two variables print x, y, z2 1 3

2, chain-assigned value

>>> x = y = somefunction

3. Increment Assignment

x +=1 for standard operators such as *,/,%

>>> x = 2>>> x +=1>>> x *=2>>> x6

Third, Python statements

If statement, Else statement, elif statement, conditional expression, while statement, for statement, break statement, continue statement, pass statement, iterators (iterator), list resolution

1Name = Raw_input ('What is your name?')2 ifName.endswith ('Gumby'):3     ifName.startswith ('Mr.'):4         Print 'Hello,mr,gumby'5     elifName.startswith ('Mrs.'):6         Print 'Hello,mrs,gumby'7     Else:8         Print 'Hello,gumby'9 Else:Ten     Print 'Hello,stranger'

Number = input (")if and number >=1:      #  Boolean operator    print'great'else:      Print'wrong'

Assertion: instead of letting the program crash at a later time, it's better to crash the error condition as it appears.

 if  not   Condition:crash program  

assert 0 < Age < +,   'The agemust is realistic'     #  condition, you can add a string to explain the assertion Traceback (most recent call last  ):"<pyshell#99> "  in <module>    assert 0 < Age < +,   'The agemust is realistic  'assertionerror:the age must being realistic

Cycle:

1. While loop

 while a<B:    Print A,   #  Note the comma at the end, which causes all output to appear on one line    a+=1      1 2 3 4 5 6 7 8 9

2. For loop

Python base 8 (expressions and statements)