读取文件

读取整个文件：

filename = "pi_digits.txt"

with open(filename) as file_object:
    content = file_object.read()
    print(content)

逐行读取文件：

filename = "pi_digits.txt"

with open(filename) as file_object:
    for line in file_object:
        print(line.rstrip())

创建文件列表，然后对列表操作：

filename = "pi_digits.txt"

with open(filename) as file_object:
    lines = file_object.readlines()

for line in lines:
    print(line.rstrip())