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What are the practical skills of Python, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

01 all or any

One of the many reasons why Python is so popular is that it is readable and expressive.

People often joke that Python is executable pseudocode. When you can write code like this, it's hard to refute.

X = [True, True, False] if any (x): print ("at least one True") if all (x): print ("all True") if any (x) and not all (x): print ("at least one True and one False") 02 dir

Have you ever thought about how to look inside a Python object to see what properties it has?

On the command line, enter:

Dir () dir ("Hello World") dir (dir)

This can be a very useful feature when running Python interactively and dynamically exploring the objects and modules you are using. Read more about functions here.

03 list (list) derivation

One of my favorite things about Python programming is its list-driven style.

These expressions can easily be written in very smooth code, almost like a natural language.

Numbers = [1city 2 is 3 city 4 5 is 7] evens = [x for x in numbers if x% 2 city 0] odds = [y for y in numbers if y not in evens] cities = ['London',' Dublin', 'Oslo'] def visit (city): print ("Welcome to" + city) for city in cities: visit (city) 04 pprint

Python's default print function does its job. But if you try to print out any large nested objects using the print function, the results are pretty ugly. The standard library's beautiful printing module pprint can print complex structured objects in an easy-to-read format.

This is a must for any Python developer who uses non-trivial data structures.

Import requestsimport pprinturl = 'https://randomuser.me/api/?results=1'users = requests.get (url). Json () pprint.pprint (users) 05 repr

When defining a class or object in Python, it is useful to provide an "official" way to represent the object as a string.

For example:

> file = open ('file.txt', 'r') > print (file)

This makes debugging code easier. Add it to your class definition, as follows:

Class someClass: def _ _ repr__ (self): return "" someInstance = someClass () # print print (someInstance) 06 sh

Python is a great scripting language. Cook may have a headache sometimes using standard os and subprocess.

The SH library allows you to call any program like a normal function-very useful for automating workflows and tasks.

Import shsh.pwd () sh.mkdir ('new_folder') sh.touch (' new_file.txt') sh.whoami () sh.echo ('This is girls') 07 Type hints

Python is a dynamically typed language. You do not need to specify a data type when defining variables, functions, classes, and so on. This allows for fast development time. However, there is nothing more annoying than run-time errors caused by simple input problems.

Starting with Python 3.5, you can choose to provide type hints when defining functions.

Def addTwo (x: Int)-> Int: return x + 2

We can also define type aliases.

From typing import ListVector = list [float] Matrix = list [vector] def addMatrix (a: Matrix, b: Matrix)-> Matrix: result = [] for iLeary in enumerate (a): result_row = [] for j, col in enumerate (row): result_row + = [a [I] [j] + b [I] [j]] result + = [result_row] return resultx = [1.0,0.0], [0.0] 1]] y = [[2.0,1.0], [0.0,2.0]] z = addMatrix (x, y)

Although not mandatory, type comments can make your code easier to understand.

They also allow you to use type checking tools to capture stray TypeError before running. This is useful if you are working on large, complex projects!

08 uuid

A quick and easy way to generate a generic unique ID (or "UUID") through the uuid module of the Python standard library.

Import uuiduser_id = uuid.uuid4 () print (user_id)

This creates a random 128-digit number that is almost certainly unique. In fact, more than 2 possible UUID can be generated. But more than five decimal systems (or 500000000000000000000000000000000).

The probability of finding repetition in a given set is extremely low. Even with a trillion UUID, the likelihood of repetition is far less than 1/1000000000.

09 wikipedia

Wikipedia has a great API that allows users to programmatically access unparalleled and completely free knowledge and information. The wikipedia module makes it very convenient to access the API.

Import wikipediaresult = wikipedia.page ('freeCodeCamp') print (result.summary) for link in result.links: print (link)

Like real sites, this module provides multilingual support, page disambiguation, random page retrieval, and even a donate () method.

10 xkcd

Humor is a key feature of the Python language. It is named after the British comedy sketch drama Python Flying Circus. Many of Python's official documents refer to the show's most famous sketches. However, Python humor is not limited to documents. Try running the following features:

Import antigravity11 zip

The finale is also a great module. Have you ever encountered the need to form a dictionary from two lists?

Keys = ['averse,' baked,'c'] vals = [1,2,3] zipped = dict (zip (keys, vals))

The zip () built-in function requires a series of iterating objects and returns a list of tuples. Each tuple groups the elements of the input object by location index.

You can also "unzip" the object * zip () by calling the object.

12 emoji

Emoji is a visual emotional symbol used in wireless communication in Japan, drawing pictures, and text refers to characters, which can be used to represent a variety of expressions, such as smiling faces, cakes for food, and so on. On Chinese mainland, emoji is usually called "Little Yellow face", or emoji.

# try to install the module pip install emoji# from emoji import emojizeprint (emojize (": thumbs_up:") 13 howdoi

When you use terminal terminal programming, you will search for answers on StackOverflow after you encounter a problem, and then you will go back to the terminal to continue programming, sometimes you will not remember the solution you found before, and you need to re-check StackOverflow, but do not want to leave the terminal, then you need to use this useful command line tool howdoi.

Pip install howdoi

No matter what question you have, you can ask it and it will try its best to reply.

Howdoi vertical align csshowdoi for loop in javahowdoi undo commits in git

But be careful-it will reproduce StackOverflow's best answer to grab the code. It may not always provide the most useful information.

Howdoi exit vim14 Jedi

The Jedi library is an autocomplete and code analysis library. It makes writing code faster and more efficient.

Unless you are developing your own IDE, you may be interested in using Jedi as an editor plug-in. Fortunately, there is already a load available!

15 * * kwargs

There are many milestones when learning any language. Using Python and understanding the mysterious * * kwargs syntax may count as an important milestone.

The double asterisk in front of the dictionary object * * kwargs** allows you to pass the contents of the dictionary to the function as a named argument.

The key to the dictionary is the parameter name, and the value is the value passed to the function. You don't even need to call it kwargs!

Dictionary = {"a": 1, "b": 2} def someFunction (a, b): print (a + b) return# do the same thing: someFunction (* * dictionary) someFunction (axi1, baked 2)

This is useful when you want to write functions that handle named parameters that are not predefined.

Python is a very diverse and well-developed language, so there must be a lot of features that I haven't considered. If you want to know more about python modules, you can click like and follow.

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