In Python, we can branch using a relatively understandable syntax:
if myVariable == "value" :
# do something
Keep in mind that:
==compares the left side and the right side
= simply assigns the right side to the left side!
# this will work
myVariable = 10
# this will also work
if myVariable == 10:
print("myVariable is 10")
# this will not work, will print out a SyntaxError
if myVariable = 10:
print("myVariable is 10")
Operators
In place of == we can also use !=>=, >, < and <=:
if temperature >= 100 :
print("Water will boil!")
if temperature > 0:
print("Water will melt!")
if temperature < 0:
print("Water will freeze!")
if temperature <= -273.15 :
print("No such temperature can exist!")
Logic
We can combine operations with the and (as well as the or and not) keywords:
batting_average = 0.320
home_runs = 25
if (batting_average > 0.300) and (home_runs >= 20):
print("This batter should be an all-star!")
if not (batting_average > 0.300) and not (home runs >= 20):
print("This batter should not be considered an all-star!")
else statements
For binary (yes-and-no) conditions, we can use the else keyword to reduce the number of if statements:
if (batting_average > 0.300) and (home_runs >= 20):
print("This batter should be an all-star!")
else:
print("This batter should not be considered an all-star!")
elif statements
For n-ary (more than two) conditions, we can use if, elif and else:
if (screen_size >= 1440):
print("Large desktop!")
elif (screen_size >= 1024) and (screen_size < 1440):
print("Small desktop!")
elif (screen_size > 768) and (screen_size < 1024):
print("Tablet size!")
else:
print("Mobile size!")
