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# Variables used in the example if statements a = 4 b = 5 c = 6 # Basic comparisons if a < b: print("a is less than b") if a > b: print("a is greater than than b") if a <= b: print("a is less than or equal to b") if a >= b: print("a is greater than or equal to b") # NOTE: It is very easy to mix when to use == and =. # Use == if you are asking if they are equal, use = # if you are assigning a value. if a == b: print("a is equal to b") # Not equal if a != b: print("a and b are not equal") # And if a < b and a < c: print("a is less than b and c") # Non-exclusive or if a < b or a < c: print("a is less than either b or c (or both)") # Boolean data type. This is legal! a = True if a: print("a is true") if not a: print("a is false") a = True b = False if a and b: print("a and b are both true") a = 3 b = 3 c = a == b print(c) # These are also legal and will trigger as being true because # the values are not zero: if 1: print("1") if "A": print("A") # This will not trigger as true because it is zero. if 0: print("Zero") # Comparing variables to multiple values. # The first if statement appears to work, but it will always # trigger as true even if the variable a is not equal to b. # This is because "b" by itself is considered true. a = "c" if a == "B" or "b": print("a is equal to b. Maybe.") # This is the proper way to do the if statement. if a == "B" or a == "b": print("a is equal to b.") # Example 1: If statement temperature = int(input("What is the temperature in Fahrenheit? ")) if temperature > 90: print("It is hot outside") print("Done") # Example 2: Else statement temperature = int(input("What is the temperature in Fahrenheit? ")) if temperature > 90: print("It is hot outside") else: print("It is not hot outside") print("Done") # Example 3: Else if statement temperature = int(input("What is the temperature in Fahrenheit? ")) if temperature > 90: print("It is hot outside") elif temperature < 30: print("It is cold outside") else: print("It is not hot outside") print("Done") # Example 4: Ordering of statements # Something with this is wrong. What? temperature = int(input("What is the temperature in Fahrenheit? ")) if temperature > 90: print("It is hot outside") elif temperature > 110: print("Oh man, you could fry eggs on the pavement!") elif temperature < 30: print("It is cold outside") else: print("It is ok outside") print("Done") # Comparisons using string/text # Note, this example does not work when running under Eclipse # because the input will contain an extra carriage return at the # end. It works fine under IDLE. userName = input("What is your name? ") if userName == "Paul": print("You have a nice name.") else: print("Your name is ok.")
# Variables used in the example if statements a = 4 b = 5 c = 6 # Basic comparisons if a < b: print("a is less than b") if a > b: print("a is greater than than b") if a <= b: print("a is less than or equal to b") if a >= b: print("a is greater than or equal to b") # NOTE: It is very easy to mix when to use == and =. # Use == if you are asking if they are equal, use = # if you are assigning a value. if a == b: print("a is equal to b") # Not equal if a != b: print("a and b are not equal") # And if a < b and a < c: print("a is less than b and c") # Non-exclusive or if a < b or a < c: print("a is less than either b or c (or both)") # Boolean data type. This is legal! a = True if a: print("a is true") if not a: print("a is false") a = True b = False if a and b: print("a and b are both true") a = 3 b = 3 c = a == b print(c) # These are also legal and will trigger as being true because # the values are not zero: if 1: print("1") if "A": print("A") # This will not trigger as true because it is zero. if 0: print("Zero") # Comparing variables to multiple values. # The first if statement appears to work, but it will always # trigger as true even if the variable a is not equal to b. # This is because "b" by itself is considered true. a = "c" if a == "B" or "b": print("a is equal to b. Maybe.") # This is the proper way to do the if statement. if a == "B" or a == "b": print("a is equal to b.") # Example 1: If statement temperature = int(input("What is the temperature in Fahrenheit? ")) if temperature > 90: print("It is hot outside") print("Done") # Example 2: Else statement temperature = int(input("What is the temperature in Fahrenheit? ")) if temperature > 90: print("It is hot outside") else: print("It is not hot outside") print("Done") # Example 3: Else if statement temperature = int(input("What is the temperature in Fahrenheit? ")) if temperature > 90: print("It is hot outside") elif temperature < 30: print("It is cold outside") else: print("It is not hot outside") print("Done") # Example 4: Ordering of statements # Something with this is wrong. What? temperature = int(input("What is the temperature in Fahrenheit? ")) if temperature > 90: print("It is hot outside") elif temperature > 110: print("Oh man, you could fry eggs on the pavement!") elif temperature < 30: print("It is cold outside") else: print("It is ok outside") print("Done") # Comparisons using string/text # Note, this example does not work when running under Eclipse # because the input will contain an extra carriage return at the # end. It works fine under IDLE. userName = input("What is your name? ") if userName == "Paul": print("You have a nice name.") else: print("Your name is ok.")
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