isEncrypted # ➊ True >>> pdfReader.getPage(0) Traceback (most recent call last): # ➋ File "<pyshell#173>", line 1, in <module> pdfReader.getPage() --snip-- File "C:\Python34\lib\site-packages\PyPDF2\pdf.py", line 1173, in getObject raise utils.PdfReadError("file has...
我还使用pytest为一些较大的示例编写了单元测试——我发现它比标准库中的unittest模块更易于使用且功能更强大。你会发现,通过在操作系统的命令行 shell 中键入python3 -m doctest example_script.py或pytest,可以验证本书中大多数代码的正确性。示例代码仓库根目录下的pytest.ini配置确保 doctests 被pytest命令收集和...
First add a @cache decorator to your module: Python decorators.py import functools # ... def cache(func): """Keep a cache of previous function calls""" @functools.wraps(func) def wrapper_cache(*args, **kwargs): cache_key = args + tuple(kwargs.items()) if cache_key not in ...
1.Python面向对象 面向对象编程,在英文中称之为Object Oriented Programming,简称OOP,是一种程序设计思想。OOP把对象作为程序的基本单元,一个对象包含了数据和操作数据的函数。 Python是一个纯天然面向对象的编程语言,在Python中,所有数据类型都可以视为对象。自定义的对象数据类型就是面向对象中的类(Class)的概念。 P...
Traceback (most recent call last): File "tel_Fee_Invoice_Info_Extract.py", line 13, in <module> import pyzbar.pyzbar as pyzbar File "<frozen importlib._bootstrap>", line 971, in _find_and_load File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked ...
Traceback (most recent call last): File "./workflowy.py", line 525, in <module> main() File "./workflowy.py", line 37, in main projects = cli.load_json(args, input_is_pipe) File "./workflowy.py", line 153, in load_json return json.load(sys.stdin) File "/System/Library/Frame...
安装前:>>> import pyautoguiTraceback (most recent call last):File "<stdin>", line 1, in <module>ModuleNotFoundError: No module named 'pyautogui'安装成功后:>>> import pyautogui>>>挑2个 pyautogui 库函数测试一下:pyautogui.position() 返回鼠标位置坐标(x,y)...
""" import http.client import string import re import os import sys import xml.etree.ElementTree as etree import stat import logging import traceback import glob import ops from hashlib import sha256 from urllib.request import urlretrieve from urllib.parse import urlparse, urlunparse from urllib....
Traceback(most recent call last):File"main.py",line25in<module>result=pd.read_excel('./pdfdata1.xlsx')File"D:\Python\lib\site-packages\pandas\util\_decorators.py",line296,inwrapperreturnfunc(*args,**kwargs)File"D:\Python\lib\site-packages\pandas\io\excel\_base.py",line304,inread_ex...
>>>mixed_types=[None,0]>>>sorted(mixed_types)Traceback(most recent call last):File"<stdin>",line1,in<module>TypeError:'<'not supported between instancesof'int'and'NoneType' 此错误显示了为什么Python无法对给定的值进行排序。它试图通过使用小于运算符(<)来确定值,以确定排序顺序中哪个值较低。例如...