filename = 'pi_digits.txt'

with open(filename) as f:#默认以只读方式打开文件

    lines = f.readlines()#读取所有行，结果为列表，每行为列表一元素

for line in lines:

    print(line.rstrip())

with open(filename) as f:#默认以只读方式打开文件

    lines = f.read()#读取所有内容给变量，结果是一串字符

print(lines)

for line in lines:#将一字符串以单个字符分别显示

    #print(line.rstrip())

    pass

filename = 'programming.txt'

with open(filename, 'a') as file_object:#以追加方式写入文件，在原有内容后面增加新内容

    file_object.write("I also love finding meaning in large datasets.\n")

    file_object.write("I love creating apps that can run in a browser.\n")

filename = 'programming.txt'

with open(filename, 'w') as file_object:#以新建方式写入文件，输入新内容

    file_object.write("I also love finding meaning in large datasetsaaa.\n")

    file_object.write("I love creating apps that can run in a browseraaa.\n")