When you did this, its name was set to __main__, which means that relative imports within it will fail, because its name does not reveal that it is in a package. Note that this will also happen if you run Python from the same directory where a module is, and then try to import ...
import os a = 1 # 导入你需要的,不要污染local空间 # 建议 from sys import copyright # 不建议 from sys import * # 包导入顺序 import sys # 系统库 import flask # 三方库 import my # 自定义库 # 利用好python的标准括号分组 # 建议 from sys import (copyright, path, modules) # 不建议 from...
if path is /foo/bar/baz.py the returnvalue would be /foo/bar/pycache/baz.cpython-32.pyc for Python 3.2.The cpython-32 string comes from the current magic tag (seeget_tag(); if sys.implementation.cache_tag is not defined thenNotImplementedError will be raised). ...
single argument of the path, returning a finderorraises"ImportError". If a finderisreturned then itiscachedin"sys.path_importer_cache"andthen usedforthat path entry. If no finder can be found but the path exists then a value of"None"isstoredin"sys.path_importer_cache"to signify that an i...
Python 默认将以下对象看作模块: 内置模块 冻结模块(Frozen modules) C 扩展 Python 源码文件(.py) Python 字节码文件(.pyc) 目录 内置模块是编译进 Python 解释器(executable)的 C 模块,随时可以调用。通过 sys.builtin_module_names 可以查看具体内容: $ python -q >>> import sys >>> sys.builtin_module...
import sys sys.path.append(<TARGET_PARENT_PATH>) import <FILE_STEM> 1. 2. 3. 在package内部import包相对路径下的文件 包其实可以看作是一种特殊的模块。例如常规包的目录中需要包含__init__.py文件,当包被导入时,该文件的顶层代码被隐式执行,就如同模块导入时顶层代码被执行,该文件就像是包的代码一样...
如果动态导入一个自从解释器开始执行以来被创建的模块(即创建了一个 Python 源代码文件),为了让导入系统知道这个新模块,可能需要调用 invalidate_caches()。 在3.3 版更改: 父包会被自动导入。 importlib.find_loader(name, path=None) 查找一个模块的加载器,可选择地在指定的 path 里面。如果这个模块是在 sys.mo...
math is part of Python’s standard library, which means that it’s always available to import when you’re running Python. Note that you write math.pi and not just simply pi. In addition to being a module, math acts as a namespace that keeps all the attributes of the module together....
python Copy From within the interpreter you can run theimportstatement to make sure that the given module is ready to be called, as in: importmath Copy Sincemathis a built-in module, your interpreter should complete the task with no feedback, returning to the prompt. This means you don’...
如果动态导入一个自从解释器开始执行以来被创建的模块(即创建了一个 Python 源代码文件),为了让导入系统知道这个新模块,可能需要调用 invalidate_caches()。 在3.3 版更改: 父包会被自动导入。 importlib.find_loader(name, path=None) 查找一个模块的加载器,可选择地在指定的 path 里面。如果这个模块是在 sys.mo...