1,安装Python
从https://www.python.org下载python安装包,点击执行安装
2,使用IDLE
1)打开IDLE,选择“File”-“New File”新建一个文件
2)输入如下代码
print('Hello,python!')
3)选择“File”-“Save”,输入文件名“hello”保存文件
4)选择“Run”-“Run Module”运行文件,查看输出结果如下
Hello,python!
3,变量
1)命名
字母、数字、下划线
2)赋值
=,input
name='wangzixi'
name=input('What's your name? ')
4,数字
整数int: 0,1,10,99999,-1,-50
浮点数float:3.14,0.05,-23.4567
5,运算符号
加:+
减:-
乘:*
除:/
括号:()
6,字符串str
'wangzixi',"wangziyi","What's your name?"
7,列表 []
family=['dad','mom','xixi','yiyi']
8,for循环
for x in range(10):
print(x)
total=0
for i in range(1,101):
total=total+i
print(total)
family=['dad','mom','xixi','yiyi']
for person in family:
print(person)
9,注释
#这是单行注释
print('Hello') #print('Hello, single line comment')
/*
这是多行注释
我是新的一行
print('Hello, multiple lines comment')
*/
10,布尔bool
真:True
假:False
x=5
x>4
x>6
11,逻辑运算
与(而且、并且):and
或(或者):or
非(取反):not
x=5
x>4 and x >3
x>4 and x> 6
x>4 or x>3
x>4 or x>6
x>6
not x>6
12,比较
大于:>
小于:<
等于:==
大于等于:>=
小于等于:<=
不等于:!=
x=5
x>4
x>=5
x<3
x<=10
x==6
x!=7
s1='hello'
s2=='world'
s='hello'
s1==s2
s1==s
13,while循环
i=1
total=0
while i<=100:
total=total+i
i=i+1
print(total)
14,条件判断
if
age=eval(input('How old are you? '))
if age>=6: #如果
print('You can go to school.')
if ...else...
age=eval(input('How old are you? '))
if age>=6: #如果
print('You can go to school.')
else: #那么、否则
print('You can't go to school.')
if...elif...else
age=eval(input('How old are you? '))
if age>=6: #如果
print('You can go to school.')
elif age>=3: #否则如果
print('You can go to youeryuan.')
else:#否则
print('You can't go to any school.')