alex python of day1

Posted 2020-09-08

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：Alex Li paoche ge   #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  1 info=""""------info of {_name}-----
 2  2 Name={_name}
 3  3 Age={_age}
 4  4 Job={_job}
 5  5 Salary={_salary}
 6  6 ---------end-------"""
 7  7 .format(_name=name,
 8  8                  _age=age,
 9  9                  _job=job,
10 10                  _salary=salary)
11 11 print(info)
12 12  
13 13 info2=
14 14 """------info of %s-----
15 15 Name=%s
16 16 Age=%d
17 17 Job=%s
18 18 Salary=%S
19 19 ---------end-------"""%(name,name,age,job,salary)
20 20 Print(info2)
21 21  
22 22 info3 =
23 23 =""""------info of {0}-----
24 24 Name={0}
25 25 Age={1}
26 26 Job={2}
27 27 Salary={3}
28 28 ---------end-------""".fomat(name,name,age,job,salary)
29 29 print(info3)

View Code

while循环

 1  1 age_of_oldboy=56
 2  2 count=0
 3  3 while count<3:                           #判断循环条件
 4  4    guess_age = int(input("guess age:"))  # input默认读取字符串
 5  5    if guess_age==age_of_oldboy:
 6  6         print("yes,good!")
 7  7         break
 8  8    elif guess_age > age_of_oldboy:
 9  9          print("think smaller")
10 10    else:
11 11          print("think bigger")
12 12    count +=1
13 13 if count==3:
14 14     print("fuck off")
15 """也可以不用elif
16 
17 age_of_oldboy=56
18 
19 count=0
20 
21 while count<3:                           #判断循环条件
22 
23    guess_age = int(input("guess age:"))  # input默认读取字符串
24 
25    if guess_age==age_of_oldboy:
26 
27         print("yes,good!")
28 
29         break
30 
31    if guess_age > age_of_oldboy:
32 
33          print("think smaller")
34 
35    if guess_age < age_of_oldboy:
36 
37          print("think bigger")
38 
39    count +=1
40 
41 else:
42 
43     print("fuck off")
44 
45 """

View Code

guess任性玩

 1  1 age_of_oldboy=56
 2  2 count=0
 3  3 while count<3:                           #判断循环条件
 4  4    guess_age = int(input("guess age:"))  # input默认读取字符串
 5  5    if guess_age==age_of_oldboy:
 6  6         print("yes,good!")
 7  7         break
 8  8    elif guess_age > age_of_oldboy:
 9  9          print("think smaller")
10 10    else:
11 11          print("think bigger")
12 12    count +=1
13 13    if count==3:
14 14        print("are you want to try again?")
15 15        continue_result=input("")
16 16        if continue_result==("no")or continue_result==("n"):
17 17            count==4
18 18        else:
19 19            count=0

View Code

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

View Code