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: 代码语言:javascript ...
# 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)。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 file_path = 'example.txt...
You can also change the font and font settings when you write text to Canvas. To change the font and its size, you can use .setFont(). First, create a new Canvas instance with the filename font-example.pdf and a letter page size: Python >>> from reportlab.pdfgen.canvas import Ca...
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). ...
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 ...
_PAT = 'pat' FILE_TYPE_MOD = 'mod' FILE_TYPE_LIC = 'lic' FILE_TYPE_USER = 'user' FILE_TYPE_FEATURE_PLUGIN = 'feature-plugin' #日志等级 LOG_INFO_TYPE = 'INFO' LOG_WARN_TYPE = 'WARNING' LOG_ERROR_TYPE = 'ERROR' # Configure the default mode for activating the deployment file....
filename = 'programming.txt'with open(filename, 'w') as file_object:file_object.write("I love programming.")file_object.write("I love create new games.") 附加写入数据 采用w 写入模式在打开文件时会将文件原有数据清空或者覆盖,如果只是希望在文件原有的内容后追加数据,需要使用 a 附加模式打开文...
In Python you can easily create and manipulate strings. In Python you can iterate over lists, tuples, and dictionaries using loops. In Python you can define and use functions to modularize your code. 第二步:读取打印 from pathlib import Path ...