Python Learning Note 2---key elements 2

Pick up the top

1, Control flow statement

1.1 If statement

A = 3

If a = = 1:

Print ("A is 1")

elif A = = 2:

Print ("A is 2")

Else

Print ("A is not a or 2")

Run results

A is not a or 2

Multiple or 0 Elif,else branches that correspond to an if statement are also optional

2,while statements

3,for...in statements

Letter:letter: (Letter,): (Letter,)

The result of the operation is:

Q is a consonant

A is a vowel

Z is a consonant

W is a consonant

S is a consonant

X is a consonant

E is a vowel

D is a consonant

C is a Consonan

4, basic exception handling

5, arithmetic operator

A+=8 equivalent to A=a+8

But for complex expressions, that's not true.

6, input \ Output

Input redirect Test.py<test.data

7, creation and invocation of functions

def functionname (arguments):

Suit

Parameters are optional and multiple parameters are separated by commas

Python Learning Note 2---key elements 2