Comments

# a valid single line commment
# for multi line commment use:

"""
Three quotes. This also acts like multi line string
"""

print("Hello world") #after a valid statement

Variables

• No datatype

x=5
y='hello'

• Casting

x = str(3)    # x will be '3'  
y = int(3)    # y will be 3  
z = float(3)

• For the type of datatype, use:

x=6
print(type(x))
#output: <class 'int'>

• Many Values to Multiple Variables

x, y, z = "Orange", "Banana", "Cherry"  
print(x)  
print(y)  
print(z)

#output: 
Orange  
Banana  
Cherry

• Unpack a Collection

fruits = ["apple", "banana", "cherry"]  
x, y, z = fruits  
print(x)  
print(y)  
print(z)

#output:
apple  
banana  
cherry

Datatypes

Type Conversion

#convert from int to float:
x = float(1)
print(x)
print(type(x))

#output:   
1.0
<class 'float'>

Random Number

Python does not have a random() function to make a random number, but Python has a built-in module called random that can be used to make random numbers:

import random    
print(random.randrange(1, 10))

Strings are Arrays

a = "Hello, World!"  
print(a[1])

#output: e

Looping Through a String

for x in "banana":  
  print(x)
#output:
b  
a  
n  
a  
n  
a