Week4-Labs.py

#Fill in the blanks of this code to print out the numbers 1 through 7.
number = 1
while number <= 7:
	print(number,)
	number=number+1

#The show_letters function should print out each letter of a word on a separate line. Fill in the blanks to make that happen.

def show_letters(word):
	for i in word:
		print(i)

show_letters("Hello")
# Should print one line per letter

#Complete the function digits(n) that returns how many digits the number has. For example: 25 has 2 digits and 144 has 3 digits.
# Tip: you can figure out the digits of a number by dividing it by 10 once per digit until there are no digits left.

def digits(n):
	count = 0
	if n == 0:
		return 1
	while (n > 0):
		count += 1
		n = n // 10
	return count


print(digits(25))  # Should print 2
print(digits(144))  # Should print 3
print(digits(1000))  # Should print 4
print(digits(0))  # Should print 1

#This function prints out a multiplication table (where each number is the result of multiplying the
# first number of its row by the number at the top of its column).
# Fill in the blanks so that calling multiplication_table(1, 3) will print out:

#1 2 3

#2 4 6

#3 6 9

def multiplication_table(start, stop):
	for x in range(start,stop+1):
		for y in range(start,stop+1):
			print(str(x*y),)
		print()

multiplication_table(1, 3)
# Should print the multiplication table shown above

#The counter function counts down from start to stop when start is bigger than stop, and counts up from start to stop otherwise.
# Fill in the blanks to make this work correctly.

def counter(start, stop):
	x = start
	if start > stop:
		return_string = "Counting down: "
		while x >= stop:
			return_string += str(x)
			if x > stop:
				return_string += ","
			x=x-1
	else:
		return_string = "Counting up: "
		while x <= stop:
			return_string += str(x)
			if x<stop:
				return_string += ","
			x=x+1
	return return_string

print(counter(1, 10)) # Should be "Counting up: 1,2,3,4,5,6,7,8,9,10"
print(counter(2, 1)) # Should be "Counting down: 2,1"
print(counter(5, 5)) # Should be "Counting up: 5"

#The even_numbers function returns a space-separated string of all positive numbers that are divisible by 2, up to and
# including the maximum that's passed into the function.#
# For example, even_numbers(6) returns 2 4 6. Fill in the blank to make this work

def even_numbers(maximum):
	return_string = ""
	for x in range(2,maximum+1):
		if (x%2==0):
			return_string += str(x) + " "
	return return_string.strip()

print(even_numbers(6))  # Should be 2 4 6
print(even_numbers(10)) # Should be 2 4 6 8 10
print(even_numbers(1))  # No numbers displayed
print(even_numbers(3))  # Should be 2

#The following code raises an error when executed. What's the reason for the error?

def decade_counter():
	while year < 50:
		year += 10
	return year

#What is the value of x at the end of the following code?
for x in range(1, 10, 3):
    print(x)

#What is the value of y at the end of the following code?
for x in range(10):
    for y in range(x):
        print(y)