写在前面

本系列教程针对有一定编程经验的伙伴快速入门python基础，一些涉及开发的常识问题，本文并不涉及。

if else 

is_hot= False
is_cold= True

if is_hot :  (可以使用 and or 连接多个条件 not 可取反)
    print("It's a hot day")
elif is_cold:
    print("It's a cold day")
else:
    print("It's a cold day")
print("Enjoy your day")

=>

 It's a cold day

 Enjoy your day

 while

i=1
while i<=5:
    print(i)
    i +=1
else:
    print(2) 跳出后执行一次
=> 1 2 3 4 5 2

for

for item in 'python':
    print(item)
=>

p
y
t
h
o
n

for item in ['Mosh','John','Sarah']:
    print(item)
=>

Mosh
John
Sarah

 

for item in range(10):
    print(item)
=> 0 1 2 3 4 5 6 7 8 9 

for item in range(5,10):
    print(item) =>5~9

for item in range(5,10,2): 步长
    print(item) => 5,7,9
循环嵌套

for x in range(4):
    for y in range(3):
        print(f'({x},{y})')
=>

(0,0)
(0,1)
(0,2)
(1,0)
(1,1)
(1,2)
(2,0)
(2,1)
(2,2)
(3,0)
(3,1)
(3,2)

 数组

matrix=[
    [1,2,3],
    [4,5,6],
    [7,8,9]
]
print(matrix[0])
print(matrix[1][1])
print(matrix[2][2])
=>
[1, 2, 3]
5
9