python编码问题和逻辑运算

时间:2022-05-04 20:32:42

1,回顾昨天课程及作业

#1、使用while循环输入 1 2 3 4 5 6 8 9 10
'''
count = 0
while count < 10:
count += 1 # count = count + 1
if count == 7:
print(' ')
else:
print(count) count = 0
while count < 10:
count += 1 # count = count + 1
if count == 7:
continue
print(count)
'''
#3、输出 1-100 内的所有奇数
#方法一:
# count = 1
# while count < 101:
# print(count)
# count += 2
#方法二:
# count = 1
# while count < 101:
# if count % 2 == 1:
# print(count)
# count += 1 #5、求1-2+3-4+5 ... 99的所有数的和
# sum = 0
# count = 1
# while count < 100:
# if count % 2 == 0:
# sum = sum - count
# else:
# sum = sum + count
# count += 1
# print(sum) #6、用户登陆(三次机会重试)
#input 心中有账号,密码 while i = 0
while i < 3:
username = input('请输入账号:')
password = int(input('请输入密码:'))
if username == '咸鱼哥' and password == 123:
print('登录成功')
else:
print('登录失败请重新登录')
i += 1

2,格式化输出

#格式化输出
# % s d
# name = input('请输入姓名')
# age = input('请输入年龄')
# height = input('请输入身高')
# msg = "我叫%s,今年%s 身高 %s" %(name,age,height)
# print(msg)
"""
name = input('请输入姓名:')
age = input('请输入年龄:')
job = input('请输入工作:')
hobbie = input('你的爱好:') msg = '''------------ info of %s -----------
Name : %s
Age : %d
job : %s
Hobbie: %s
------------- end -----------------''' %(name,name,int(age),job,hobbie)
print(msg)
"""
name = input('请输入姓名')
age = input('请输入年龄')
height = input('请输入身高')
msg = "我叫%s,今年%s 身高 %s 学习进度为3%%s" %(name,age,height)
print(msg)

3,while else循环语句

count = 0
while count <= 5 :
count += 1
if count == 3:break
print("Loop",count) else:
print("循环正常执行完啦")
print("-----out of while loop ------")

4,初始编码

01010100        新
11010000 开
11010100 一
01100000 家
11000000 看
11000000 看 01010100011101110101011110110
A B C
01000001 01000010 01000011
电报,电脑的传输,存储都是01010101 最早的'密码本' ascii 涵盖了英文字母大小写,特殊字符,数字。
01010101
ascii 只能表示256种可能,太少,
创办了万国码 unicode
16表示一个字符不行,32位表示一个字符。
A 01000001010000010100000101000001
B 01000010010000100100001001000010
我 01000010010000100100001001000010
Unicode 升级 utf-8 utf-16 utf-32
8位 = 1字节bytes
utf-8 一个字符最少用8位去表示,英文用8位 一个字节
欧洲文字用16位去表示 两个字节
中文用24 位去表示 三个字节
utf-16 一个字符最少用16位去表示 gbk 中国人自己发明的,一个中文用两个字节 16位去表示。 11000000 1bit 8bit = 1bytes
1byte 1024byte = 1KB
1KB 1024kb = 1MB
1MB 1024MB = 1GB
1GB 1024GB = 1TB

5,逻辑运算

#and or not
#优先级,()> not > and > or
# print(2 > 1 and 1 < 4)
# print(2 > 1 and 1 < 4 or 2 < 3 and 9 > 6 or 2 < 4 and 3 < 2)
# T or T or F
#T or F
# print(3>4 or 4<3 and 1==1) # F
# print(1 < 2 and 3 < 4 or 1>2) # T
# print(2 > 1 and 3 < 4 or 4 > 5 and 2 < 1) # T
# print(1 > 2 and 3 < 4 or 4 > 5 and 2 > 1 or 9 < 8) # F
# print(1 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6) # F
# print(not 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6) # F #ps int ----> bool 非零转换成bool True 0 转换成bool 是False
# print(bool(2))
# print(bool(-2))
# print(bool(0))
# #bool --->int
# print(int(True)) # 1
# print(int(False)) # 0 '''x or y x True,则返回x'''
# print(1 or 2) # 1
# print(3 or 2) # 3
# print(0 or 2) # 2
# print(0 or 100) # 100 # print(2 or 100 or 3 or 4) # 2 # print(0 or 4 and 3 or 2)
'''x and y x True,则返回y'''
# print(1 and 2)
# print(0 and 2)
print(2 or 1 < 3)
print(3 > 1 or 2 and 2)