Python Conditions

Python conditions
x = 2
print(x == 2) # prints out True
print(x == 3) # prints out False
print(x < 3) # prints out True

Notice that variable assignment is done using a single equals operator "=", whereas comparison between two variables is done using the double equals operator "==". The "not equals" operator is marked as "!=".

Boolean operators

The "and" and "or" boolean operators allow building complex boolean expressions, for example:

name = "John"
age = 23
if name == "John" and age == 23:
    print("Your name is John, and you are also 23 years old.")

if name == "John" or name == "Rick":
    print("Your name is either John or Rick.")

The "in" operator

The "in" operator could be used to check if a specified object exists within an iterable object container, such as a list:

name = "John"

if name in ["John", "Rick"]:

    print("Your name is either John or Rick.")

Python uses indentation to define code blocks, instead of brackets. The standard Python indentation is 4 spaces, although tabs and any other space size will work, as long as it is consistent. Notice that code blocks do not need any termination.

Here is an example for using Python's "if" statement using code blocks:

if <statement is="" true="">:

    <do something="">

    ....

    ....

elif <another statement="" is="" true="">: # else if

    <do something="" else="">

    ....

    ....

else:

    <do another="" thing="">

    ....

    ....

</do></do></another></do></statement>

x = 2

if x == 2:

    print("x equals two!")

else:

    print("x does not equal to two.")

print(not False) # Prints out True

print((not False) == (False)) # Prints out False

The "not" operator

Using "not" before a boolean expression inverts it: