Python中文件是对象

当前位置:

首页 > 编程开发 > python爬虫 >

Python中文件是对象

文件：Python中文件是对象；
Python相对路径
with open(‘../china.txt') as file1:
content=file1.read()
print(content)
“D:\Python实例\第一章\china\test.txt”
“../../../第五章/china/test2.txt”
“china/test.txt”
“../../”

Python逐行读取
with open('test.txt') as file1:
for line in file1:
      print(line)

readline() 方法
用于从文件读取整行，包括 "\n" 字符。如果指定了一个非负数的参数，则返回指定大小的字符数，包括 "\n" 字符。
with open("writeline.txt","r",encoding="gbk") as file1:
    print(file1.readline(5))

readlines() 方法
用于读取整个文件（所有行）到一个列表，可以由for... in ... 结构进行遍历；列表的每一行变成列表的每一个元素。
with open("china.txt","r",encoding="gbk") as file1:
    lines=file1.readlines()
    for line in lines:
        print(line)
read
readline
readlines

read() 方法
用于从文件中读取指定的字符数，如果未给定或为负则读取所有。
with open("china.txt","r",encoding="gbk") as file1:
    lines=file1.read()
    print(lines)

.

栏目列表