全局变量
apple=10
b=20
def fun():
global b
b=apple
return b+40
print(apple)
print('b pass:',b)
print(fun())
print('b now:',b)
输出结果
10
b pass: 20
50
b now: 10
安装模块
Mac: 终端环境里
- 安装：sudo pip3 install numpy
- 卸载：sudo pip3 uninstall numpy
- 更新：sudo pip3 install -U bumpy
文件读写
程序
text = 'one line\ntwo line.\nthree line.'
file = open('new_file.txt','w')
file.write(text)
file.close()
输出结果
one line
two line.
three line.
16
