2022年4月25日：通过Python构建真实的应用程序 --Python简介

DXB2021

已于 2022-04-28 18:53:53 修改

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分类专栏： Python 文章标签： python

于 2022-04-25 18:57:35 首次发布

本文链接：https://blog.youkuaiyun.com/DXB2021/article/details/124408083

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Web编程

数据分析

机器学习

什么是Python？

创建于20世纪90年代初期

用途十分广泛，范围涉及从自动执行重复性任务和编写Web应用到构建机器学习模型和实现神经网络。

运行Python代码

Python是一种解释型语言，无需进行编译。

有两种方式执行Python代码：交互模式和脚本模式。

Python实现

CPython通常用于Web开发、应用程序开发和脚本编辑。

Anaconda：专为科学编程任务（如数据科学和机器学习）量身定制的专业Python发行版。

IronPython：基于.NET运行时构建的Python的开放源代码实现。

Jupyter Notebook：基于Web的交互式编程环境，支持包括Python在内的各种编程语言。Jupyter笔记本在研究和学术领域得到广泛运用，用于数学建模、机器学习、统计分析以及编码的教学与学习。

借助Python使用Azure Cloud Shell进行开发。

使用REPL

可以输入较短的语句并对这些语句进行计算。

Python REPL

Python支持交互式控制台体验。“读取-求值-输出-循环”

REPL功能

使用REPL可执行大多数能在代码文件中执行的操作：

运行并计算语句。

声明变量和函数

使用内置帮助。

使用帮助

REPL有一个可用于查找关键字和函数的内置帮助函数。此函数的通用语法是：

help([object])

交互式帮助控制台

如果不将参数传递到帮助函数，则会启动交互式帮助工具。

键入help()以进入交互式帮助控制台。

>>> help()

Welcome to Python 3.10's help utility!

If this is your first time using Python, you should definitely check out
the tutorial on the internet at https://docs.python.org/3.10/tutorial/.

Enter the name of any module, keyword, or topic to get help on writing
Python programs and using Python modules.  To quit this help utility and
return to the interpreter, just type "quit".

To get a list of available modules, keywords, symbols, or topics, type
"modules", "keywords", "symbols", or "topics".  Each module also comes
with a one-line summary of what it does; to list the modules whose name
or summary contain a given string such as "spam", type "modules spam".

help> string
Help on module string:

NAME
    string - A collection of string constants.

MODULE REFERENCE
    https://docs.python.org/3.10/library/string.html

    The following documentation is automatically generated from the Python
    source files.  It may be incomplete, incorrect or include features that
    are considered implementation detail and may vary between Python
    implementations.  When in doubt, consult the module reference at the
    location listed above.

DESCRIPTION
    Public module variables:

    whitespace -- a string containing all ASCII whitespace
    ascii_lowercase -- a string containing all ASCII lowercase letters
    ascii_uppercase -- a string containing all ASCII uppercase letters
    ascii_letters -- a string containing all ASCII letters
    digits -- a string containing all ASCII decimal digits
    hexdigits -- a string containing all ASCII hexadecimal digits
    octdigits -- a string containing all ASCII octal digits
    punctuation -- a string containing all ASCII punctuation characters
    printable -- a string containing all ASCII characters considered printable

CLASSES
    builtins.object
        Formatter
        Template

    class Formatter(builtins.object)
     |  Methods defined here:
     |
     |  check_unused_args(self, used_args, args, kwargs)
     |
     |  convert_field(self, value, conversion)
     |
     |  format(self, format_string, /, *args, **kwargs)
     |
     |  format_field(self, value, format_spec)
     |
     |  get_field(self, field_name, args, kwargs)
     |      # given a field_name, find the object it references.
     |      #  field_name:   the field being looked up, e.g. "0.name"
     |      #                 or "lookup[3]"
     |      #  used_args:    a set of which args have been used
     |      #  args, kwargs: as passed in to vformat
     |
     |  get_value(self, key, args, kwargs)
     |
     |  parse(self, format_string)
     |      # returns an iterable that contains tuples of the form:
     |      # (literal_text, field_name, format_spec, conversion)
     |      # literal_text can be zero length
     |      # field_name can be None, in which case there's no
     |      #  object to format and output
     |      # if field_name is not None, it is looked up, formatted
     |      #  with format_spec and conversion and then used
     |
     |  vformat(self, format_string, args, kwargs)
     |
     |  ----------------------------------------------------------------------
     |  Data descriptors defined here:
     |
     |  __dict__
     |      dictionary for instance variables (if defined)
     |
     |  __weakref__
     |      list of weak references to the object (if defined)

    class Template(builtins.object)
     |  Template(template)
     |
     |  A string class for supporting $-substitutions.
     |
     |  Methods defined here:
     |
     |  __init__(self, template)
     |      Initialize self.  See help(type(self)) for accurate signature.
     |
     |  safe_substitute(self, mapping={}, /, **kws)
     |
     |  substitute(self, mapping={}, /, **kws)
     |
     |  ----------------------------------------------------------------------
     |  Class methods defined here:
     |
     |  __init_subclass__() from builtins.type
     |      This method is called when a class is subclassed.
     |
     |      The default implementation does nothing. It may be
     |      overridden to extend subclasses.
     |
     |  ----------------------------------------------------------------------
     |  Data descriptors defined here:
     |
     |  __dict__
     |      dictionary for instance variables (if defined)
     |
     |  __weakref__
     |      list of weak references to the object (if defined)
     |
     |  ----------------------------------------------------------------------
     |  Data and other attributes defined here:
     |
     |  braceidpattern = None
     |
     |  delimiter = '$'
     |
     |  flags = re.IGNORECASE
     |
     |  idpattern = '(?a:[_a-z][_a-z0-9]*)'
     |
     |  pattern = re.compile('\n            \\$(?:\n              ...identifie...

FUNCTIONS
    capwords(s, sep=None)
        capwords(s [,sep]) -> string

        Split the argument into words using split, capitalize each
        word using capitalize, and join the capitalized words using
        join.  If the optional second argument sep is absent or None,
        runs of whitespace characters are replaced by a single space
        and leading and trailing whitespace are removed, otherwise
        sep is used to split and join the words.

DATA
    __all__ = ['ascii_letters', 'ascii_lowercase', 'ascii_uppercase', 'cap...
    ascii_letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
    ascii_lowercase = 'abcdefghijklmnopqrstuvwxyz'
    ascii_uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
    digits = '0123456789'
    hexdigits = '0123456789abcdefABCDEF'
    octdigits = '01234567'
    printable = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTU...
    punctuation = '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'
    whitespace = ' \t\n\r\x0b\x0c'

FILE
    c:\users\a-xiaobodou\appdata\local\programs\python\python310\lib\string.py


help>

You are now leaving help and returning to the Python interpreter.
If you want to ask for help on a particular object directly from the
interpreter, you can type "help(object)".  Executing "help('string')"
has the same effect as typing a particular string at the help> prompt.
>>>