Comparison Operators
radius = 4 |
Python Operator |
Name |
Example |
Result |
< |
less than |
radius < 0 |
FALSE |
<= |
less than or equal to |
radius <= 0 |
FALSE |
> |
greater than |
radius > 0 |
TRUE |
>= |
greater than or equal to |
radius >= 0 |
TRUE |
== |
equal to |
radius == 0 |
FALSE |
!= |
not equal to |
radius != 0 |
TRUE |
Generating Random Numbers
randint(a, b) # random int between a and b
1 import random
2
3 # Generate random numbers
4
5 number2 = random.randint(0, 9)
6
7 # Prompt the user to enter an answer
8 answer = eval(input("What is "+ + " + "
9 + str(number2) + "? "))
10
11 # Display result
12 print(number1, "+", number2, "=", answer,
13 "is", number1 + number2 == answer)
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If statements
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One-way If statements A one-way if statement executes the statements if the condition is true.
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Two-Way if-else Statements A two-way if-else statement.A two-way if-else statement decides which statements to execute based on whether the condition is true or false.
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Nested if and Multi-Way if-elif-else Statements One if statement can be placed inside another if statement to form a nested if statement.
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Logical Operators
Operator |
Description |
not |
logical negation |
and |
logical conjunction |
or |
logical disjunction |
Operator Precedence Chart
+, - (Unary plus and minus)
** (Exponentiation)
not
*, /, //, % (Multiplication, division, integer division, and remainder)
+, - (Binary addition and subtraction)
<, <=, >, >= (Comparison)
==, != (Equality)
and
or
=, +=, -=, *=, /=, //=, %= (Assignment operators) |
one-way if
1 number = eval(input("Enter an integer: "))
2
3 if :
4 print("HiFive")
5
6 if :
7 print("HiEven")
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two-way if-else
1 import random
2
3 # 1. Generate two random single-digit integers
4 number1 = random.randint(0, 9)
5 number2 = random.randint(0, 9)
6
7 # 2. If number1 < number2, swap number1 with number2
8 if number1 < number2:
9 number1, number2 = number2, number1 # Simultaneous assignment
10
11 # 3. Prompt the student to answer "What is number1 - number2?"
12 answer = eval(input("What is "+ str(number1) + " - " +
13 str(number2) + "? "))
14
15 # 4. Check the answer and display the result
16 if number1 - number2 == answer:
17 print("You are correct!")
18 else:
19 print("Your answer is wrong.\n", number1, '-',
20 number2, "is", number1 - number2, '.')
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Nested if and Multi-Way if-elif-else
1 year = eval(input("Enter a year: "))
2 zodiacYear = year % 12
3 if zodiacYear == 0:
4 print("monkey")
5 elif zodiacYear == 1:
6 print("rooster")
7 elif zodiacYear == 2:
8 print("lion")
9 elif zodiacYear == 3:
10 print("goat")
11 elif zodiacYear == 4:
12 print("rat")
13 elif zodiacYear == 5:
14 print("ox")
15 elif zodiacYear == 6:
16 print("tiger")
17 elif zodiacYear == 7:
18 print("rabbit")
19 elif zodiacYear == 8:
20 print("dragon")
21 elif zodiacYear == 9:
22 print("snake")
23 elif zodiacYear == 10:
24 print("horse")
25 else:
26 print("sheep")
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ComputeBMI.py
1 # Prompt the user to enter weight in pounds
2 weight = eval(input("Enter weight in pounds: "))
3
4 # Prompt the user to enter height in inches
5 height = eval(input("Enter height in inches: "))
6
7 KILOGRAMS_PER_POUND = 0.45359237 # Constant
8 METERS_PER_INCH = 0.0254 # Constant
9
10 # Compute BMI
11 weightInKilograms = weight * KILOGRAMS_PER_POUND
12 heightInMeters = height * METERS_PER_INCH
13 bmi = weightInKilograms / (heightInMeters * heightInMeters)
14
15 # Display result
16 print("BMI is", format(bmi, ".2f"))
17 if bmi < 18.5:
18 print("Underweight")
19 elif bmi < 25:
20 print("Normal")
21 elif bmi < 30:
22 print("Overweight")
23 else:
24 print("Obese")
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LeapYear.py
1 year = eval(input("Enter a year: "))
2
3 # Check if the year is a leap year
4 isLeapYear =
5
6
7 # Display the result
8 print(year, "is a leap year?", isLeapYear)
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