python函数、模块、文件操作
函数
- 使用关键字参数时，参数顺序可以变化
python
def func(a , b):
print(a,b)
func(b=1,a=2)- 默认参数
python
def func(a=1 , b=2):
print(a,b)
func()- 可变参数
python
def func(a, *b):
print(a,b)
func(1,2,3,4)- 匿名函数
python
# 类似js里a => a*2
func = lambda a: a*2
func(3)模块
- 安装指定版本模块
python
pip install numpy==1.26.1- 导入
python
import math
import math as m # math取别名m
from math import add # 导入add方法
from math import * # 导入math所有方法文件操作
- 复制
python
import shutil
fileSource = '/a/source.jpg'
fileTarget = '/b/source.jpg'
shutil.copyfile(fileSource,fileTarget)- 移动
python
import shutil
fileSource = '/a/source.jpg'
fileTarget = '/b/source.jpg'
shutil.move(fileSource,fileTarget)- 删除
python
import os
fileTarget = '/b/source.jpg'
os.remove(fileTarget)- 读取文本
python
# 读取全部内容
with open('a.text', 'r') as file:
content = file.read()
print(content)
# 逐行读取
with open('b.txt', 'r') as file:
line = file.readline()
while line:
print(line, end=' ')
line = file.readline()
# 读取所有行
with open('c.txt', 'r') as file:
lines = file.readlines()
print(lines)- 写入文本
python
with open('a.text', 'w') as file:
file.write("你好")
# 逐行写入
lines = ['第1','第2']
with open('a.text', 'w') as file:
file.writelines(line + '\n' for line in lines)