What is... Python ? Easy to learn !

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When you make conversation, you use a language like English.  In the computer, you can talk to your computer in programming language to make them work ! 

Python is the one of the languages where you can talk to the computer.  We're going to learn how to use python ๐Ÿ˜Š


First, just download python. Search on google "Python" 

Second, you can set up "Visual studio code" or "Pycharm"  to run the Python easily 


1.  Print 

if you just type words like "hello", computer receive the word but not showing on the screen. 

To make them show on the screen ,  we say, print("hello")

print("hello")


2. Variables and Data Types
In Python, you can designate valuables like "character's name or age" 

let's say you want to make 100 sentences and they're all have same variable. you may not want to put the variable at every single sentences.  In Python, It makes things easier.

-------------------- 
Let's say,, character's name is so long ? let's make this

character_name = "Jayeeeeeeeeeeeeeeeeeeeeeeeeee"
chracter_age = "30"


print(character_name + " goes to school everyday" + " he is " + chracter_age + "." + character_name + " also likes pasta and pizza.")


and "run" 

Jayeeeeeeeeeeeeeeeeeeeeeeeeee goes to school everyday he is 30.Jayeeeeeeeeeeeeeeeeeeeeeeeeee also likes pasta and pizza.


Remember  you need "" or ''  to print string :) 


3. len 

len function tells you how many words in there 

phrase = "Jay world"
print(len(phrase))

9


4. [ ]  
you can specify the index inside the square brackets

phrase = "Jay world"
print(phrase[0])

J

In Python , string gets index starting with 0 

Jay    world 
012 3 45678


following this function
phrase = "Jay world3"
print(phrase[4])

you'll get "w" 


Backwards:
it starts with -1 

phrase = "Jay world"
print(phrase[-3])



In here,  you'll get "r" 



phrase = "Jay world"
print(phrase[-6])


What are you going to get ?


-------------------------------------- " " (space)



5. Index 
index function tells you where a specific character or string is located !

phrase = "Jay world"
print(phrase.index("r"))



you'll get "6"  


if you type like this
phrase = "Jay world"
print(phrase.index("wor"))


you'll get "4" because  'w' is the start index in the phrase. 


6. Replace 

If you want to replace some string or character, you can use "replace" function. 


replace("A", "B") :  A is the one that you want to change, B is the one to replace with
phrase = "Jay world"
print(phrase.replace("Jay", "Fun"))


Now you're going to get "Fun world"  instead of  Jay world. 



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