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python中文件的创建与写入实战代码

作者：DevGeek

这篇文章主要给大家介绍了关于python中文件的创建与写入的相关资料,在Python中文件写入提供了不同的模式和方法来满足不同的需求,文中通过代码介绍的非常详细,需要的朋友可以参考下

1.利用内置函数获取文件对象

2. 文件操作的模式之写入：

3. 文件对象的操作方法之写入保存：

以下是一个示例代码，演示如何使用open函数获取文件对象并进行写入保存操作：

# 打开文件并获取文件对象
file = open("example.txt", "w")
# 写入单行文本
file.write("Hello, world!\n")
# 写入多行文本
lines = ["This is line 1\n", "This is line 2\n", "This is line 3\n"]
file.writelines(lines)
# 关闭文件
file.close()

在上述示例中，我们首先使用open函数以写入模式打开名为"example.txt"的文件，获取了文件对象file。然后，我们使用文件对象的write方法写入了单行文本和writelines方法写入了多行文本。最后，我们调用了close方法关闭文件。

请确保在写入完成后调用close方法来关闭文件，以释放文件资源和确保写入的数据被保存。

操作完成后，必须使用close方法！
避坑指南：
#当打开的文件中有中文的时候，需要设置打开的编码格式为utf-8或gbk，视打开的原文件编码格式而定

实战

在这里插入代码片# coding:utf-8
# @Author: DX
# @Time: 2023/5/29
# @File: package_open.py
import os
def create_package(path):
    if os.path.exists(path):
        raise Exception('%s已经存在,不可创建' % path)
    os.makedirs(path)
    init_path = os.path.join(path, '__init__.py')
    f = open(init_path, 'w', encoding='utf-8')
    f.write('# coding: utf-8\n')
    f.close()
class Open(object):
    def __init__(self, path, mode='w', is_return=True):
        self.path = path
        self.mode = mode
        self.is_return = is_return
    def write(self, message):
        f = open(self.path, mode=self.mode, encoding='utf-8')
        try:
            if self.is_return and message.endswith('\n'):
                message = '%s\n' % message
                f.write(message)
        except Exception as e:
            print(e)
        finally:
            f.close()
    def read(self, is_strip=True):
        result = []
        with open(self.path, mode=self.mode, encoding='utf-8') as f:
            data = f.readlines()
        for line in data:
            if is_strip:
                temp = line.strip()
                if temp != '':
                    result.append(temp)
                else:
                    if line != '':
                        result.append(line)
        return result
if __name__ == '__main__':
    current_path = os.getcwd()
    # path = os.path.join(current_path, 'test2')
    # create_package(path)
    open_path = os.path.join(current_path, 'b.txt')
    o = open('package_datetime.py', mode='r', encoding='utf-8')
    # o = os.write('你好~')
    data1 = o.read()
    print(data1)

输出结果（遍历了package_datetime.py中的内容）：

# coding:utf-8
# Time: 2023/5/28
# @Author: Dx
# @File:package_datetime.py
from datetime import datetime
from datetime import timedelta
now = datetime.now()
print(now, type(now))
now_str = now.strftime('%Y-%m-%d %H:%M:%S')
print(now_str, type(now_str))
now_obj = datetime.strptime(now_str, '%Y-%m-%d %H:%M:%S')
print(now_obj, type(now_obj))
print('===========================================')
three_days = timedelta(days=3)  # 这个时间间隔是三天，可以代表三天前或三天后的范围
after_three_days = three_days + now
print(after_three_days)
after_three_days_str = after_three_days.strftime('%Y/%m/%d %H:%M:%S:%f')
print(after_three_days_str, type(after_three_days_str))
after_three_days_obj = datetime.strptime(after_three_days_str, '%Y/%m/%d %H:%M:%S:%f')
print(after_three_days_obj, type(after_three_days_obj))
print('===========================================')
before_three_days = now - three_days
print(before_three_days)
before_three_days_str = before_three_days.strftime('%Y/%m/%d %H:%M:%S:%f')
print(before_three_days_str, type(before_three_days_str), '=================')
before_three_days_obj = datetime.strptime(before_three_days_str, '%Y/%m/%d %H:%M:%S:%f')
print(before_three_days_obj, type(before_three_days_obj))
print('===========================================')
one_hour = timedelta(hours=1)
after_one_hour = now + one_hour
after_one_hour_str = after_one_hour.strftime('%H:%M:%S')
print(after_one_hour_str)
after_one_hour_obj = datetime.strptime(after_one_hour_str, '%H:%M:%S')
print(after_one_hour_obj, type(after_one_hour_obj))
# default_str = '2023 5 28 abc'
# default_obj = datetime.strptime(default_str, '%Y %m %d')
进程已结束,退出代码0

package_datetime.py

# coding:utf-8
# Time: 2023/5/28
# @Author: Dx
# @File:package_datetime.py
from datetime import datetime
from datetime import timedelta
now = datetime.now()
print(now, type(now))
now_str = now.strftime('%Y-%m-%d %H:%M:%S')
print(now_str, type(now_str))
now_obj = datetime.strptime(now_str, '%Y-%m-%d %H:%M:%S')
print(now_obj, type(now_obj))
print('===========================================')
three_days = timedelta(days=3)  # 这个时间间隔是三天，可以代表三天前或三天后的范围
after_three_days = three_days + now
print(after_three_days)
after_three_days_str = after_three_days.strftime('%Y/%m/%d %H:%M:%S:%f')
print(after_three_days_str, type(after_three_days_str))
after_three_days_obj = datetime.strptime(after_three_days_str, '%Y/%m/%d %H:%M:%S:%f')
print(after_three_days_obj, type(after_three_days_obj))
print('===========================================')
before_three_days = now - three_days
print(before_three_days)
before_three_days_str = before_three_days.strftime('%Y/%m/%d %H:%M:%S:%f')
print(before_three_days_str, type(before_three_days_str), '=================')
before_three_days_obj = datetime.strptime(before_three_days_str, '%Y/%m/%d %H:%M:%S:%f')
print(before_three_days_obj, type(before_three_days_obj))
print('===========================================')
one_hour = timedelta(hours=1)
after_one_hour = now + one_hour
after_one_hour_str = after_one_hour.strftime('%H:%M:%S')
print(after_one_hour_str)
after_one_hour_obj = datetime.strptime(after_one_hour_str, '%H:%M:%S')
print(after_one_hour_obj, type(after_one_hour_obj))
# default_str = '2023 5 28 abc'
# default_obj = datetime.strptime(default_str, '%Y %m %d')

总结 

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