Print("hello word!")#打印hello word!向python世界发生第一声呐喊，仪式很重要
定义变量
name="Alex Li"
name2=name
print("my name is ",name,name2)
输出结果：my name is Alex Li Alex Li
name="paoche ge"
print(name,name2)
输出结果： paoche ge Alex Li #nam2通过name找到Alex的内存地址,name重新赋值，会开辟另一个内存地址存paoche ge,name2还是alex
变量赋值不能有空格，第一个字符必须是（字母或_，可有字母，_和数字组成，大小写敏感）
PIE=3.1415296 #可以用大写字母表示常量
input
1 name=input("name:")
2 age=int(input("age:")) #interger
3 job=input("job:")
4 salary=input("salary:")
格式输出
1 info=""""------info of {_name}-----
2 Name={_name}
3 Age={_age}
4 Job={_job}
5 Salary={_salary}
6 ---------end-------"""
7 .format(_name=name,
8 _age=age,
9 _job=job,
10 _salary=salary)
11 print(info)
12
13 info2=
14 """------info of %s-----
15 Name=%s
16 Age=%d
17 Job=%s
18 Salary=%S
19 ---------end-------"""%(name,name,age,job,salary)
20 Print(info2)
21
22 info3 =
23 =""""------info of {0}-----
24 Name={0}
25 Age={1}
26 Job={2}
27 Salary={3}
28 ---------end-------""".fomat(name,name,age,job,salary)
29 print(info3)
while循环
1 age_of_oldboy=56
2 count=0
3 while count<3: #判断循环条件
4 guess_age = int(input("guess age:")) # input默认读取字符串
5 if guess_age==age_of_oldboy:
6 print("yes,good!")
7 break
8 elif guess_age > age_of_oldboy:
9 print("think smaller")
10 else:
11 print("think bigger")
12 count +=1
13 if count==3:
14 print("fuck off")
"""也可以不用elif
age_of_oldboy=56
count=0
while count<3: #判断循环条件
guess_age = int(input("guess age:")) # input默认读取字符串
if guess_age==age_of_oldboy:
print("yes,good!")
break
if guess_age > age_of_oldboy:
print("think smaller")
if guess_age < age_of_oldboy:
print("think bigger")
count +=1
else:
print("fuck off")
"""
guess任性玩
1 age_of_oldboy=56
2 count=0
3 while count<3: #判断循环条件
4 guess_age = int(input("guess age:")) # input默认读取字符串
5 if guess_age==age_of_oldboy:
6 print("yes,good!")
7 break
8 elif guess_age > age_of_oldboy:
9 print("think smaller")
10 else:
11 print("think bigger")
12 count +=1
13 if count==3:
14 print("are you want to try again?")
15 continue_result=input("")
16 if continue_result==("no")or continue_result==("n"):
17 count==4
18 else:
19 count=0
for循环
1 for i in range(10):
2 print("------",i)
3 for j in range(10):
4 print(j)
5 if j>5:
6 break #跳出当前整个循环//continue 是跳出本次循环继续下次循环
for循环之猜年龄
1 age_of_oldboy=56
2 i=0
3 for i in range (3): #判断循环条件
4 guess_age = int(input("guess age:")) # input默认读取字符串
5 if guess_age==age_of_oldboy:
6 print("yes,good!")
7 break
8 elif guess_age > age_of_oldboy:
9 print("think smaller")
10 else:
11 print("think bigger")
12 i+=1
13 if i==3:
14 print("fuck off")
15
16 for i in range(0,10,3): #从0开始到10结束，每隔三个打印一个
17 print("loop",i)
18 for i in range(10):
19 print("------",i)
20 for j in range(10):
21 print(j)
22 if j>5:
23 break #跳出当前整个循环//continue 是跳出本次循环继续下次循环