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Exercise 4

Write a function called increment_counter that increments a counter variable every time it is called. You can test your code with the following:

print(counter)                # 0

increment_counter()
print(counter)                # 1

increment_counter()
print(counter)                # 2

counter = 100
increment_counter()
print(counter)                # 101

Solution

counter = 0

def increment_counter():
    global counter
    counter += 1

In this solution, we've first initialized a global counter variable to 0. Our increment_counter function simply increments this variable each time the function is called. However, since we're using counter += 1 in the code, we need to tell Python that counter, as used in increment_counter, is a global variable. We do this by including global counter in the function definition.

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