tuples (class slides)

CSc 110 - tuples

Variable length parameter

Sometimes you want to handle a variable number of parameters (like print does)

print(1, 2, 3)

1 2 3

Variable length parameter

You can add a * before your parameter name so that it accepts a variable number of arguments, gathering them into a tuple

def concatenate(*values):
  new_string = ""
  for v in values:
    new_string += str(v) + " "
  return new_string[:-1]

def main():
  print( concatenate("The", "temperature", "is", 82, "degrees"))
  
main()

The temperature is 82 degrees

Write a function

1. Its name is maximum
2. It takes a variable number of arguments: *values
3. It returns the highest value in values

assert maximum(1) == 1
assert maximum(3,1) == 3
assert maximum(2,4,6) == 6
assert maximum() == None

Write a function – solution

def maximum(*values):
  result = None
  for v in values:
    if result == None or v > result:
      result = v
  return result

def main():
  assert maximum(1) == 1
  assert maximum(3,1) == 3
  assert maximum(2,4,6) == 6
  assert maximum() == None
  print("Passed all tests")
  
main()

Passed all tests

Quiz 09

current time

You have 10 minutes to complete the quiz

• No need for comments, no need for a main(), no need for test cases

Allowed built-in functions: round(), input(), float(), str(), int(), len(), range()

Write a function

1. Its name is min_max
2. It takes a variable number of arguments: *values
3. It returns the highest and lowest values in values

assert min_max(1) == (1, 1)
assert min_max(3,1) == (1, 3)
assert min_max(2,4,6) == (2, 6)
assert min_max() == (None, None)

Write a function – solution

def min_max(*values):
  max = None
  min = None
  for v in values:
    if max == None or v > max:
      max = v
    if min == None or v < min:
      min = v
  return min, max

def main():
  assert min_max(1) == (1, 1)
  assert min_max(3,1) == (1, 3)
  assert min_max(2,4,6) == (2, 6)
  assert min_max() == (None, None)
  print("Passed all tests")
  
main()

Passed all tests