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Python303 Cheat Sheet by

Vocabulary

Variable
something that can change
string
list of characters
integer
whole number
float
decimal number
syntax
grammar/ structure of language
modulo
remainder
boolean
true/false

Example

Print (2) - integer
Print (2.5) - floating point
Print ("He­llo­") - string
Print (mystr) - variable
Print (mystr­,"Hi­" ,2,1,0) -- commas
 
mystr = "­Hi"
mystr <- name
"­Hi" <- variable can change
print (int(1.5)) -> 1

Random list

# Create a list of integers and floating point numbers and strings
mylist = [1.0,1,2,2.0]
random_item = randomchoice(mylist)
print (mylist, random_item)

# create a list of the following variables
myvar1 = 1
myvar2 = 2
myvar3 = 3
varlist = [myvar1,myvar2,myvar3]
random_var = random.choice(varlist)
print (varlist, random_var)
 

Loop

even Count = 0
odd Count = 0
while True:
       num = int(input("Enter a positive integer))
       if num < 0:
          print ("Even numbers: ", evenCount)
          print ("Odd numbers: ", oddCount)
          break
      else:
          if (num%2) == 0
               evenCount = evenCount+ 1
          else:
               oddCount = oddCount + 1

Ex

Example:
 - 9 is divisible by 3.
 - 7 is not divisible by 3.

 user_num = input("Enter the number: ")
 if user_num%3 == 0:
    print(user_num, "is divisible by 3")
 else:
    print(user_num, " is not divisible by 3")

function continue

#function call
testFunction (“this is the parameter value”)
#function with 2 parameters and a return value
def function3(param1, param2):
   print(‘This function has 2 parameters’)
   return param1 + param2 # return value
#function call and store the result in a variable
returnValue = function3(2, 3)
print (returnValue)
 

Countdown string

while True:
     user_input = input("Enter a number: ")

     number = int(user_input)

     countdown_string= ""

     while number > 0:
         countdown_string = countdown_string + str(number)
         number = number - 1

     print (countdown_string)

 The result will be:

 Enter a number: 6
 654321

Decision Making­/Co­ndi­tional Statem­ents:

if 3 < 2: # if statement must compare two Booleans
     print ('3 is less than 2')
elif 4 < 2: #can have 0 or more elif statements
     print ('4 is less than 2')
elif 5 < 2:
    print ('5 is less than 2')
else: #can have 0 or 1 else statement at the end
   print ('none of the above are True')
 

Area of Triangle

#return: area
user_base = float(input('Enter the base of the triangle: '))
user_height = float(input('Enter the height of the triangle: '))

def areaOfTriangle(base,height):
    return 1/2 base height # or 0.5 base height
                    
print('The area of the triangle is',areaOfTriangle(user_base, user_height))

Condit­ional While Loop

count = 0 # start at zero
while count < 10: # loop while count is less than 10
         print(count) #will print numbers 0 - 9
         count = count + 1 # must increase count

Radius

while True:
     user_radius = input("Please enter the radius of the circle: ")
     radius = float(user_radius)
     pi = 3.1415
     area = pi radius * 2
     print("The area of the cicle is", area)

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