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LearnPython/LearnTheBasics/7_Conditions.py
2024-09-13 15:12:25 +02:00

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Python

x = 2
print(x == 2) # prints out True
print(x == 3) # prints out False
print(x < 3) # prints out True
#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 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.")
#Here is an example for using Python's "if" statement using code blocks:
statement = False
another_statement = True
if statement is True:
# do something
pass
elif another_statement is True: # else if
# do something else
pass
else:
# do another thing
pass
x = 2
if x == 2:
print("x equals two!")
else:
print("x does not equal to two.")
#Unlike the double equals operator "==", the "is" operator does not match the values of the variables, but the instances themselves. For example:
x = [1,2,3]
y = [1,2,3]
print(x == y) # Prints out True
print(x is y) # Prints out False
#Using "not" before a boolean expression inverts it:
print(not False) # Prints out True
print((not False) == (False)) # Prints out False
# Exercise
# Change the variables in the first section, so that each if statement resolves as True.
# change this code
number = 16
second_number = False
first_array = [True, True, True]
second_array = [True,2]
if number > 15:
print("1")
if first_array:
print("2")
if len(second_array) == 2:
print("3")
if len(first_array) + len(second_array) == 5:
print("4")
if first_array and first_array[0] == 1:
print("5")
if not second_number:
print("6")