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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | >>> 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 --
|
相关推荐：《Python教程》
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）
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | >>> 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")
