03-variables.py

#Variables are containers for storing data values.

#Python has no command for declaring a variable.
#A variable is created the moment you first assign a value to it.
x = 5
y = "John"
print(x)
print(y)

#Variables do not need to be declared with any particular type, and can even change type after they have been set.
x = 4       # x is of type int
x = "Sally" # x is now of type str
print(x)

#If you want to specify the data type of a variable, this can be done with casting.
x = str(3)
y = int(3)
z = float(3)

print(x)
print(y)
print(z)

#You can get the data type of a variable with the type() function.
x = 5
y = "John"
print(type(x))
print(type(y))

#String variables can be declared either by using single or double quotes:
x = "John"
print(x)
#double quotes are the same as single quotes:
x = 'John'
print(x)

#Variable names are case-sensitive.
a = 4
A = "Sally"

print(a)
print(A)