Introduction to Python 3 Cheat Sheet
Python is a high-level programming language which was designed by Guido Van Rossum and developed by Python software foundation in 1990. It has a paradigm of Object oriented, imperative and procedural reflective. The parent company of python is a Python software foundation. It is used for web development, software development, and system scripting. now learn about the Python 3 cheat sheet
Importance of Python
- It can work with a different platform like MacOs, Windows and Linux.
- The Program in python 3 CheatSheet can be written in few lines in comparison with other programming languages.
- Python supports the procedural, object-oriented or functional way of programming.
How to install Python in your system?
- You can install python in your system free by going on the below link :
https://www.python.org/ - Once Python is installed in your system type the command python –version it will reflect the install version of the python.
Some basics of Python 3 Cheat Sheet Programming
- Your first python program. Type the below command print (“what is your name?”) and press the enter it will generate the output what is your name?
- If you want to comment down something in python using the below procedure:
#comment which you want to put.
Python 3 Cheat Sheet
Some of the Python 3 Cheat Sheet are given below:
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Storing variable
Print(“Hello World”) and the out will be Hello World.
Hello message with a variable
a = “Hello World”
Print(a)
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How to deal with a list in the python3 Cheat sheet?
car = [‘Maruti’, ‘Audi’, ‘Ford’]
Getting the first item from the list
first_car = car[0]
Adding item to the list
car = []
append(‘Maruti’)
Slicing a list
car = [‘Maruti’, ‘Audi’, ‘Ford’]
first_two = car[:2]
list.append(val) → (add item at end)
list.extend (seq) → (add a sequence of an item at the end)
list.insert (idx,val) → (insert item at index)
list.remove (val) → (remove the first item with value val)
list.pop([idx]) → value (remove and return item at index idx)
list.sort (Sort the list)
list.reverse (Reverse the list)
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Tuples
Tuples are similar like the list but the only difference is that items of the list cannot be modified.
area = (1000, 2000)
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Conditional operators
| equals | x == 42 |
| not equal | x!= 42 |
| greater than | x > 42 |
| greater than or equal to | x >= 42 |
| less than | x < 42 |
| less than or equal to | x <= 42 |
-
Dictionaries
Dictionaries stores the connections between the data For Eg:
car = {‘color’: ‘green’, ‘seats’: 5}
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-
User Input
Forgetting the data from the user we use this syntax.
name = input(“What’s your name? “)
This will generate the output of — What’s your name?
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Variable assignments
In this python 3 cheat sheet command we can define the variables by the following way:
x=2.2+9+cos(y)
a=b=c=0 (assignment to same value)
y, z, r=2, -7.6, 0 (multiple assignments)
a, b=b, a (values swap)
a,*b=seq
*a, b=seq (item and list)
x+=3 (Increment → x=x+3)
x-=2 (decrement → x=x-2)
x=None (Constant value)
del x (remove name x)
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Conversions
int (“19”) → 15
int (“3f”,19) → 72 (Can specify integer number base in 2nd parameter
int (15.56) → 15 (Truncate decimal part)
float(“-12.24e9”) → -12240000000.0
round(15.56,1)→ 15.6 (rounding to 1 decimal)
bytes ([71,6,90]) → b’G\x06Z’
list(“abc”) → [‘a’,’b’,’c’]
set([“one”, “two”]) → {‘one’, ‘two’}
Spitted on white spaces → list of str, For example:
“I am back”.split() → [‘I’, ‘am’, ‘back’]
Spitted on seperator → list of str, For example:
“I, am, back”.split() → [‘I’, ‘am’, ‘back’]
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Sequence container indexing
Suppose there is a list = [10, 20, 30, 40, 50] for this list indexing will be like this:
list[0] = 10
list[1] = 20
list[2] = 30
list[-1] = 50
list[-2] = 40
list[:-1] → [10,20,30,40]
list[1:-1] → [20,30,40]
list[::2] → [10,30,50]
list[::-1] → [50,40,30,20,10]
list[::-2] → [50,30,10
list[:] → [10,20,30,40,50]
list[1:3] → [20,30]
list[-3:-1] → [30,40]
list[:3] → [10,20,30]
list[3:] → [40,50]
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Maths
sin(pi/4) → 707
cos(2*pi/3) → -0.4999
sqrt(81) → 9.0
log(e**2) → 2.0
ceil(12.5) → 13
floor(12.5) → 12
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Display
Sep= “ “ (item seperator, default space)
end= “\n” (end of print, default new line)
file=sys.stdout (print to file, default standard output)
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Generic operations on containers
len(c) → items count
min(c) → minimum
max(c) → maximum
Sum(c) → sum of the list
sorted(c) → list in sorted manner.
How Python 3 Cheat Sheet is different from Version 2
Let us know how it differs from version 2.
- Division operator
For a case 7/5 or -7/5 then the output in python 2 will be 1 and -2 respectively but in python3 the output will be 1.4 and -1.4
- Unicode
In Python2 str type is ASCII but in version 3 it is Unicode.
Conclusion
In the current era of Technology python, 3 Cheat Sheet is a great way of learning a programming language. Many companies are now using it like Google, Facebook, YouTube. If you are a python3 developer then you can earn up to 92000$ every year.
Recommended Articles
This has been a guide to Python 3 Cheat Sheet. Here we have discussed basic concept, and command as well as free tips and tricks of Python 3 cheat sheet. You may also look at the following article to learn more –
