ZipFile对象在概念上类似于你在前一章看到的由open()函数返回的File对象:它们是程序与文件交互的值。要创建一个ZipFile对象,调用zipfile.ZipFile()函数,传递给它 ZIP 文件的文件名的字符串。注意zipfile是 Python 模块的名字,ZipFile()是函数的名字。 例如,在交互式 Shell 中输入以下内容: 代码
1. 写数据(write) 写入数据通常涉及将信息保存到文件、数据库或其他持久性存储介质中。以下是一些常见的数据写入场景的示例: 1.1 写入文本文件 使用内置的 open 函数来打开文件并写入内容。确保使用适当的模式(例如,'w' 表示写入)。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 file_path = 'example.txt...
# 如果文件存在则报错:FileExistsError: [Errno 17] File exists: 'demo4.txt' f = open('demo41.txt',mode='x',encoding='utf-8') f.write('人生苦短,我用python') f.close() ###===+模式打开文件=== # f = open('demo4.txt','+') #ValueError: Must have exactly one of create/read...
'r'openforreading (default)'w'openforwriting, truncating thefilefirst'x'create anewfileandopenitforwriting'a'openforwriting, appendingtotheendofthefileifit exists'b' binary mode't'textmode (default) '+'opena diskfileforupdating (readingandwriting)'U'universal newline mode (deprecated) 打开一...
1. 写数据(write) 写入数据通常涉及将信息保存到文件、数据库或其他持久性存储介质中。以下是一些常见的数据写入场景的示例: 1.1 写入文本文件 使用内置的 open 函数来打开文件并写入内容。确保使用适当的模式(例如,'w' 表示写入)。 file_path = 'example.txt' # 写入文件 with open(file_path, 'w') as fi...
mode. Other common values are 'w' for writing (truncating the file if it already exists), 'x' for creating and writing to a new file, and 'a' for appending (which on some Unix systems, means that all writes append to the end of the file regardless of the current seek position). ...
Open a new editor window in IDLE, create a new .py file called save_to_txt.py, and type in the following code: Python save_to_txt.py 1from pathlib import Path 2 3from pypdf import PdfReader 4 5pdf_path = ( 6 Path.home() 7 / "creating-and-modifying-pdfs" 8 / "practice_f...
cursor.execute(""" CREATE TABLE IF NOT EXISTS users ( id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(100), email VARCHAR(100) )""") 运行 四、CRUD操作 1. 插入数据 sql = "INSERT INTO users (name, email) VALUES (%s, %s)"values = ('Alice', 'alice@example')cursor.execute(sql, val...
mode file.readinto file.truncate file.encoding file.mro file.readline file.write file.errors file.name file.readlines file.writelines file.fileno file.newlines file.seek file.xreadlines file.flush file.next file.softspace In [6]: f1=open('/etc/passwd','r') In [7]: f1 Out[7]: <open ...
You don’t need to modify your WAVReader object, which already provides the means necessary to jump to a given position in a WAV file. As earlier, you’ll create a new script file to handle the visualization. Name the script plot_oscilloscope.py and fill it with the source code below:...