Python笔记

1、获取桌面路径

import os

desktop_path = os.path.join(os.path.expanduser('~'), 'Desktop')
print('desktop_path: ' + desktop_path)

 2、读写文件

#写入文件
file = open(full_path, 'w')
file.write(msg)
file.close()

#读取文件
file = open(full_path, 'r')
content = file.read()
file.close()
print(content)

 3、算数运算

a = 10
b = 20
print(a + b) #加:30
print(a - b) #减:-10
print(a * b) #乘:200
print(a / b) #除:0.5
print(a % b) #取模:10
print(a ** b) #幂函数:100000000000000000000
print(9 // 2) #取整除:4
print(9.0 // 2.0) #取整除:4.0

 4、字符串格式化

a = '{},我学{}'.format('人生苦短', 'Python')
b = '{preposition},我学{lang}'.format(preposition = '人生苦短', lang = 'Python')
c = '{0},我学{1}'.format('人生苦短', 'Python')
print(a) #人生苦短,我学Python
print(b) #人生苦短,我学Python
print(c) #人生苦短,我学Python

 5、比较运算

print(1 > 2) #False
print(1 < 2 < 3) #True
print(42 != '42') #True
#print(42 > '42') #TypeError: '>' not supported between instances of 'int' and 'str'
print('Name' == "name") #False
print(True > False) #True,等价于:1 > 0
print(True + False > False + False) #True,等价于:1 + 0 > 0 + 0

 

posted @ 2024-01-24 09:00  xhubobo  阅读(8)  评论(0编辑  收藏  举报