Python Cheat Sheet 2020



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Python Cheat Sheet 2020

Basics

Print a number print(123)
Print a string print('test')
Adding numbers print(1+2)
Variable assignment number = 123
Print a variable print(number)
Function call x = min(1, 2)
Comment # a comment

Types

Integer 42
String 'a string'
List [1, 2, 3]
Tuple (1, 2, 3)
Boolean True

Useful functions

Write to the screen print('hi')
Calculate lengthlen('test')
Minimum of numbersmin(1, 2)
Maximum of numbersmax(1, 2)
Cast to integerint('123')
Cast to stringstr(123)
Cast to booleanbool(1)
Range of numbersrange(5, 10)
Python

Other syntax

Return a value return 123
Indexing 'test'[0]
Slicing 'test'[1:3]
Continue to next loop iteration continue
Exit the loop break
List append numbers = numbers + [4]
List append (with method call) numbers.append(4)
List item extraction value = numbers[0]
List item assignment numbers[0] = 123

Terminology

syntax the arrangement of letters and symbols in code
program a series of instructions for the computer
print write text to the screen
string a sequence of letters surrounded by quotes
variable a storage space for values
value examples: a string, an integer, a boolean
assignment using = to put a value into a variable
function a machine you put values into and values come out
call (a function) to run the code of the function
argument the input to a function call
parameter the input to a function definition
return value the value that is sent out of a function
conditional an instruction that's only run if a condition holds
loop a way to repeatedly run instructions
list a type of value that holds other values
tuple like a list, but cannot be changed
indexing extracting one element at a certain position
slicing extracting some elements in a row
dictionary a mapping from keys to values

Reminders

  • Strings and lists are indexed starting at 0, not 1
  • Print and return are not the same concept
  • The return keyword is only valid inside functions
  • Strings must be surrounded by quotes
  • You cannot put spaces in variable or function names
  • You cannot add strings and integers without casting
  • Consistent indentation matters
  • Use a colon when writing conditionals, function definitions, and loops
  • Descriptive variable names help you understand your code better

Conditionals

Lists

Defining functions

Loops

Dictionaries

Comparisons

Python
Equals
Not equals !=
Less than <
Less than or equal <=
Greater than >

Useful methods

String to lowercase 'xx'.lower()
String to uppercase 'xx'.upper()
Split string by spaces 'a b c'.split(' ')
Remove whitespace around string ' a string '.strip()
Combine strings into one string ' '.join(['a', 'b'])
String starts with 'xx'.startswith('x')
String ends with 'xx'.endswith('x')
List count [1, 2].count(2)
List remove [1, 2].remove(2)
Dictionary keys {1: 2}.keys()
Dictionary values {1: 2}.values()
Dictionary key/value pairs {1: 2}.items()

Other neat bonus stuff

Zip lists zip([1, 2], ['one', 'two'])
Set my_set = {1, 2, 3}
Set intersection {1, 2} & {2, 3}
Set union {1, 2} | {2, 3}
Index of list element [1, 2, 3].index(2)
Sort a list numbers.sort()
Reverse a list numbers.reverse()
Sum of list sum([1, 2, 3])
Numbering of list elements for i, item in enumerate(items):
Read a file line by line for line in open('file.txt'):
Read file contents contents = open('file.txt').read()
Random number between 1 and 10 import random; x = random.randint(1, 10)
List comprehensions [x+1 for x in numbers]
Check if any condition holds any([True, False])
Check if all conditions hold all([True, False])

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Python Cheat Sheet 2020Let us know here.

Advance Python Cheat sheet from beginners to advance 2020. With the help This cheat sheet You will be able to Understand Python basic with reference.You can download Free these Python cheats
Python Cheat Sheet for Lists
Python Cheat Sheet for dictionaries
Python Cheat Sheet for if statements and while loops
Python Cheat Sheet for functions
Python Cheat Sheet for classes
Python Cheat Sheet for Files & Exceptions
Python Cheat Sheet for Testing Code
Python Cheat Sheet for Pygame
Python Cheat Sheet for Matplotlib
Python Cheat Sheet for Pygal
Python Cheat Sheet for Django

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Basic Concepts

Integers 1,2,3,4,5,6,76,
Floating-point numbers2.4 , 2.3, 4.5, 4.5 ,
String ‘abc’ , ‘ads’ , ‘aaa’

Basic Math Operator used in Python

+Addition
–Subtraction
*Multiplication
/Division
//Integer division
**Exponent

Examples of Operators

Addition

2+3=5

Subtraction

3-2=1

Multiplication

2*2=4

Division

4/2=2

Integer Division

22//8 =2

Exponent

2**3=8

Best Cheat Sheet For Python

Comparison Operations

>=Greater than or Equal to
<=Less than or Equal to
>Greater Than
<Less than
!=Not equal to
Equal to

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