Day1 python基础1

 一、Hello World 

print("Hello World!")

 二、变量以及字符编码 

变量名只能是字母，数字，下划线，且第一个不能是数字
以下关键字不能声明为变量名
['and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else',
'except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is',
'lambda', 'not', 'or', 'pass', 'print', 'raise', 'return', 'try', 'while', 'with', 'yield']

 1 name = "Zhang wb"
 2 name2 = name
 3 print("my name is",name,name2)  
 4 
 5 name = "Sha Shan"
 6 gf_of_oldboy = "Rlongyi"
 7 
 8 PIE = "常量"
 9 
10 print(name,name2)

 

ASCII 255 1B,GB2312 7XXX汉字,GBK 2xxxx汉字,GB18030 27000汉字  向下兼容
Unicode万国码 2B
UTF-8可变长，英文-ascii 1B，中文-utf8 3B

 三、注释 

单行注释  #注释内容

多行注释  ‘’‘注释内容’‘’或“”“注释内容”“”

 四、输入 

1 username=input("username:")
2 password=input("password:")
3 print(username,password)
需注意input的结果是字符串
输入密码时不可见，可利用getpass
1 import  getpass
2 #pycharm不好用
3 password = getpass.getpass("password:")
不同形式的输入
 1 name=input("name:")
 2 age=int(input("age:"))
 3 job=input("job:")
 4 info = '''
 5 --------- info of %s ----
 6 Name:%s
 7 Age:%d
 8 Job:%s
 9 '''%(name,name,age,job)
10 print(info)
%s 字符串，%d，整数，%f，浮点数
 1 name=input("name:")
 2 age=int(input("age:"))
 3 job=input("job:")
 4 info2 = '''
 5    --------- info of {_name}----
 6 Name:{_name}
 7 Age:{_age}
 8 Job:{_job}
 9 '''.format(_name=name,_age=age,_job=job)
10 print(info2)
name=input("name:")
age=int(input("age:"))
job=input("job:")
info3 = '''
          --------- info of {0}----
Name:{0}
Age:{1}
Job:{2}
'''.format(name,age,job)
print(info3)

 五、if...else... 

猜年龄

 1 age = 56
 2 
 3 guess_age = int(input("guess age:"))
 4 
 5 if guess_age == age :
 6     print("yes,you get it")
 7 elif guess_age > age :
 8     print("think smaller...")
 9 else:
10     print("thinker bigger...")

 六、while 

while死循环

1 count = 0
2 while True:
3     print("count:",count)
4     count+=1

利用while实现只有三次机会的猜年龄

 1 count = 0
 2 while count < 3:
 3     guess_age = int(input("guess age:"))
 4     if guess_age == age:
 5         print("yes,you get it")
 6         break
 7     elif guess_age > age:
 8         print("think smaller...")
 9     else:
10         print("thinker bigger...")
11     count+=1
12 else:
13     print("you have tried too many times...")
14 #循环正常走完，执行else，break的话不执行else

 七、for 

利用for输出0--9

1 for i in range(10):
2     print("loop",i)
3 print("")

利用for输出5到9的奇数

1 for i in range(5,10,2):
2     print("loop", i)

利用for实现只有三次机会的猜年龄

 1 age = 56
 2 
 3 for count in range(3):
 4     guess_age = int(input("guess age:"))
 5     if guess_age == age:
 6         print("yes,you get it")
 7         break
 8     elif guess_age > age:
 9         print("think smaller...")
10     else:
11         print("thinker bigger...")
12 
13 else:
14     print("you have tried too many times...")

猜年龄任意玩

age = 56
count = 0
while count < 3 :
    guess_age = int(input("guess age:"))
    if guess_age == age:
        print("yes,you get it")
        break
    elif guess_age > age:
        print("think smaller...")
       # print(count)
    else:
        print("thinker bigger...")
    count+=1
    if count == 3:
        countinue_confirm = input("do you want to keep guessing..?(y/n)")
        if countinue_confirm != 'n' :
            count = 0

 








posted @ 2018-01-02 21:11  挤成肉夹馍  阅读(152)  评论(0)  编辑  收藏  举报