python 2018/8/25

# 含多空格字符串的分割

hello = "hello python hello"
print(a.split(" ")) # ['hello', 'python', '', 'hello']

print(hello.split())  # ['hello', 'python', 'hello']
print(len(a.split(" ")[2])) # ''也是一个字符串类型数据，只是什么都没有 # 0
print(a.split(" ")[2]) # 没有任何内容
print(type(a.split(" ")[2])) # <class 'str'> 字符串类型

# 字符串定义

hello = """hello python""" # hello python
hell0 = ""hello python"" # SyntaxError: invalid syntax

list1 = [10,3.13,'hello',True]
list1.append(3)
print(list1)

list1[2] = '你好'
print(list1)
list1.remove('你好')
print(list1)
# list1.remove('nihao') # ValueError: list.remove(x): x not in list
list1.pop(-2)
print(list1)

# 关于del的两种删除方式
del list1[0]
print(list1)
del(list1[0])
print(list1)

#关于while的break

内循环里执行 break 不会导致外循环一起结束
j = 0
while j < 3:
print("外层运行中")
i = 0
while i < 6:
if i ==4:
break
print("内层运行中")
i += 1
if j ==2:
break
j += 1

名片管理系统

 while True:
     print("欢迎使用ITV1.0")
     active = True
     while True:
         if active:
             name = input("请输入姓名：(按q退出）")
             if name == 'q':
                 break
             length_name = len(name)
             if (length_name < 6) or (length_name > 20):
                 print("长度错误")
                 continue
             else:
                 pass
             while True:
                 if active:
                     tel = input("请输入手机号：(按q返回上一级）")
                     if tel == 'q':
                         break
                     length_tel = len(tel)
                     if length_tel != 11:
                         print("长度不合法")
                         continue
                     else:
                         pass
                     while True:
                         sex = input("请输入性别：(按q返回上一级）")
                         if sex == 'q':
                             break
                         if sex == '男' or sex == '女':
                             print("录入成功")
                             active = False
                         else:
                             print("性别错误")
                             continue
                         print("*" * 5 + "名片信息" + "*" * 5)
                         print("姓名：%s" % name)
                         print("手机号: %s" % tel)
                         print("性别：%s" % sex)
                         break
                 else:
                     break
         else:
             break
     ask = input("是否继续录入信息？y/n")
     if ask == 'n':
         print("谢谢使用V1.0")
         break