python入门级_读取文本文件

打开文件

with open('XXX') as file_object:
    contents = file_object.read()
    print(contents)
    print(contents.rstrip())
# 关键字with在不需要访问文件后将其关闭
#rstrip()方法可删掉字符串末尾的空白

相对路径与绝对路径。windows系统中的路径要用‘\’

逐行读取

filename = 'XXX'
with open(filename) as file_object:
    for line in file_object:
        print(line)

python读取文本文件时，会将所有文本均解读为字符串。

写入文档

filename = 'XXX'
with open(filename,'w') as file_object:
    file_object.write('XXX')

类编码风格：类名采用驼峰命名法，即将类名中的每个单词的首字母大写，而不使用下划线。实例名和模块名都采用小写格式，并在单词之间加上下划线。

存储数据

import json
number = [2,3,4,5,6,7]
filename = 'XXX'
with open(filename,'w') as f_obj:
    json.dump(number,f_obj)

import json
filename = 'C:\\Users\\happy\\Desktop\\pi_digits.txt'
with open(filename) as f_obj:
    numbers = json.load(f_obj)

print(numbers)