Python learning notes conditions, loops, and other statements

First, Function Import

1. Provide aliases for the module

>>> Import Math as Foobar #设置math alias Foobar

>>> Foobar.sqrt (4)

Showing: 2.0

2. Provide aliases for functions

>>> from math import sqrt as Foobar

>>> Foobar (4)

Showing: 2.0

Second, assign the value

1, multi-value assignment

>>> x,y,z=1,2,3

>>> print (x, y, z)

Show:

2, multi-value exchange

>>> x,y=y,x

>>> print (x, y, z)

Display: 2,1,3

3. Increment Assignment

>>> x=2

>>> x+=1

>>> x*=2

>>> x

Showing: 6

Iii. conditional execution and if statements

1. If nesting code

>>> Name=input (' What's your name? ‘)

>>> if Name.endswith (' Gumby '):

>>> if Name.startswith (' Mr. '):

>>> print (' Hello, Mr Gumby ')

>>> elif name.startswith (' Mrs. ')

>>> print (' Hello, Mrs. Gumby ')

>>> Else:

>>> print (' Hello, Gumby ')

>>> Else:

>>> print (' Hello,stranger ')

2, is, the identity operator, and = = are similar, but in fact not the same

>>> x=y=[1,2,3]

>>> z=[1,2,3]

>>> x==y

Display: True

>>> x==z

Display: True

>>> x is y

Display: True

>>> X is Z

Display: False

3, in, membership operator

>>> if ' s ' in Name:

>>> print (' Your name contains the letter "s")

>>> Else:

>>> print (' Your name does not contain ' s '. ')

4. Assert, Assert

>>>age=-1

>>> assert 0<age<100, ' the must be realistic '

Showing: assertionerror:the must be realistic

5. While loop

>>> x=1

>>> while x<= 100:

>>> Print (x)

>>> x+=1

6. For loop

>>> numbers=[0,1,2,3,4,5,6,7]

>>> for number in numbers:

>>> Print (number)

Python learning notes conditions, loops, and other statements