So basically it's a good idea to write code that is easy to read. This article may be recommended for anyone who wants to aim for Shortest Code in all languages or Shortest Code in Python with Python !!

1.0 Basic input operation

1.1 Commonly used functions

eval() A function that executes a string. [](Maybe it can be used in ...)

# 1 + 2
a = input()
print(eval(a))
# 3

replace() It replaces the string of the first function with the string of the second argument. In the example below, spaces are replaced with the string "2".

# 1 3 4
a = input()
print(a.replace('4','5'))
# 1 3 5

You can also do this in combination with the eval () function described above.

# 10 3
print(eval(input().replace(' ','-'))) #10-Will do 3
# 7

[](Maybe it can be used in ...)

1.2 Commonly used operators

Assignment operators such as + =,-=

It's a familiar assignment operator! !! This kind of thing is recommended because it shortens the code and speeds up the process! !!

# 45
a = int(input())
a = a + 5
print(a)
# 50

The code above does exactly the same as the code below.

# 45
a = int(input())
a += 5
print(a)
# 50

~-and-~

~ Is a bit operator that inverts bits. It is generally known that when an integer is bit-inverted, the number becomes negative and -1. For example, in the example below

a = 9
print(~a)
# -10

The number of -1 was output with the negative value. If you want to know more about this, go to "2's complement"! !!

You can take advantage of it to write a-1 and a + 1 in shorter code. However, the caveat is that unlike the assignment operator above, the variable itself does not change.

a = 9
print(~-a)
print(-~a)
print(a)
# 8
# 10
# 9

By the way, the execution order is as follows.

a = 9
print(~(-a))
print(-(~a))
# 8
# 10

1.3 Other techniques

Assign a function to a variable

In Python you can assign a function to a variable. This allows you to use frequently used long-named functions shorter without using def.

p = print
p(3)
# 3

Use bool as an integer

Basically, in Python, the compiler will read False = 0, True = 1 in such a place. So you can also do the following:

mylist = [0,3,5,4]
print(mylist[True])#mylist[1]Is outputting
print(mylist[False])#mylist[0]Is outputting
# 3
# 0

2.0 Basic output operation

list output

In Python, if you normally output a list, commas and parentheses will be added, so you can not output it as it is. Therefore, it is necessary to devise the following.

How to use an asterisk

You can get a nice output by adding an asterisk before the list. It can also be written concisely.

mylist = ['Alice','Bob',,4]
print(mylist)
print(*mylist)#I was able to clean it
# [0, 3, 5, 4]
# 0 3 5 4

10.0 Finally

Actually, this article is my first article ＞ ＜ I think there are still some places where I'm not used to Qiita. So if you find a typographical error, something that is hard to see, or something that is hard to understand, please comment more and more. We may also add a variety of new code and techniques. Finally, thank you for reading this article!