Conditions and Branching

Conditions

Comparison

i = 1
print(i >= 7)  # greater or equals

Output

False

i = 12
print(i != 10)
# != means "not equals"
# -> it's true that 12 isn't = 10

Output

True

• this goes the same to strings

print("kevin" == "ph4n")  # this a false
print("kevin" != "ph4n")  # this a true

Output

False
True

Branching

if

age = 18
if age > 21:
    print("you may drink alcohol")

print("keep it going")

# -> if the statement is False -> it passes to the next

Output

keep it going

else

age = 18
if age > 21:
    print("you may drink alcohol")
else:
    print("get out")

print("keep it going")

# the system checks if the "if (age > 21)" is true or false -> processes the else
# whether if the if condition is true or false, "keep it going" will still be there

Output

get out
keep it going

age = 22
if age > 21:
    print("you may drink alcohol")
else:
    print("get out")

print("keep it going")

Output

you may drink alcohol
keep it going

elif (short for else if)

age = 21
if age > 21:
    print("you may drink alcohol")
elif age == 21:
    print("you may drink it...only this time okay?")
else:
    print("get out")

print("keep it going")

Output

you may drink it...only this time okay?
keep it going

Logic Operators

or

A	B	A or B
False	False	False
False	True	True
True	True	True

born_year = 2008
if (born_year < 2000) or (born_year > 2009):
    print("kevinph4n was born in the 90s or 2010s")
else:
    print("kevinph4n was born in 2000s")

Output

kevinph4n was born in 2000s

and

A	B	A and B
False	False	False
False	True	False
True	False	False
True	True	True

born_year = 2008
if (born_year > 2007) and (born_year < 2009):
    print("kevinph4n was born in 2008")

Output

kevinph4n was born in 2008