help()函数帮助我们了解模块、类型、对象、方法、属性的详细信息。
1、帮助查看类型详细信息,包含类的创建方式、属性、方法
>>> help(list) Help on class list in module builtins: class list(object)| list() -> new empty list| list(iterable) -> new list initialized from iterable's items|| Methods defined here:|| __add__(self, value, /)| Return self+value.|| __contains__(self, key, /)| Return key in self.|| __delitem__(self, key, /)| Delete self[key].|| __eq__(self, value, /)| Return self==value.|| __ge__(self, value, /)| Return self>=value.|| __getattribute__(self, name, /)| Return getattr(self, name).|| __getitem__(...)| x.__getitem__(y) <==> x[y]|| __gt__(self, value, /)| Return self>value.|| __iadd__(self, value, /)| Implement self+=value.|| __imul__(self, value, /)| Implement self*=value.|| __init__(self, /, *args, **kwargs) -- More --
2、帮助查看方法的详细使用信息(使用时要注意输入完整路径,使用模块帮助时,需要先导入模块)
>>> from selenium.webdriver.common.by import By >>> help(By) Help on class By in module selenium.webdriver.common.by: class By(builtins.object)| Set of supported locator strategies.|| Data descriptors defined here:|| __dict__| dictionary for instance variables (if defined)|| __weakref__| list of weak references to the object (if defined)|| ----------------------------------------------------------------------| Data and other attributes defined here:|| CLASS_NAME = 'class name'|| CSS_SELECTOR = 'css selector'|| ID = 'id'|| LINK_TEXT = 'link text'|| NAME = 'name'|| PARTIAL_LINK_TEXT = 'partial link text'|| TAG_NAME = 'tag name'|| XPATH = 'xpath' >>>
3、举例如下:
查看python所有的关键字:help("keywords")
查看python所有的modules:help("modules")
查看python所有的modules中包含指定字符串的modules: help("modules yourstr")
查看python中常见的topics: help("topics")
查看python标准库中的module:import os.path + help("os.path")
查看python内置的类型:help("list")
查看python类型的成员方法:help("str.find")
查看python内置函数:help("open")