Several ways to read python files read readline readlines

1. read(): Read all the content of the file at one time, suitable for small files. Examples are as follows:

with open('123.txt', 'r') as f:
    print(f.read(), end='')  # end=''用来关闭print默认添加换行符

2. read(size): Read at most size bytes each time, suitable for large files. Examples are as follows:

with open('123.txt', 'r') as f:
    while True:
        str = f.read(16)    # 每次读取16字节
        if not str:
            break
        print(str, end='')

3. readline(): Read one line at a time. Examples are as follows:

with open('123.txt', 'r') as f:
    while True:
        str = f.readline()    # 每次读取一行
        if not str:
            break
        print(str, end='')

4. readlines(): Read all the content at once and return a list by line, suitable for configuration files. Examples are as follows:

with open('123.txt', 'r') as f:
    for line in f.readlines():
        print(line, end='')