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Lära While Loop | Introduction to Python 2/2
Introduction to Python for Data Analysis

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While Loop

While loop is another type of loops. It performs the same, but the construction of the loop differs.

# Summing all prices
prices = [3, 5, 6, 2, 7, 8]
i = 0
counter = 0

while i < len(prices):
counter += prices[i]
i += 1

print(counter)
12345678910
# Summing all prices prices = [3, 5, 6, 2, 7, 8] i = 0 counter = 0 while i < len(prices): counter += prices[i] i += 1 print(counter)
copy

When we want to stop our loop immediately, we need to use break.

prices = [1, 2, 3, 4, 5, 6]
i = 0

while i < len(prices):
if prices[i] == 4:
break
else:
print(prices[i])
i += 1
123456789
prices = [1, 2, 3, 4, 5, 6] i = 0 while i < len(prices): if prices[i] == 4: break else: print(prices[i]) i += 1
copy

We use a special variable (counter in our case) to collect elements of the price list (in our case). If you want to count the sum of the numbers from 1 to 10, you also have to create a variable that collects the sum after each iteration.

For more practice with loops try this course!

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Let's count all money from the list until the sum equals the 100!

  1. Set the while loop to work with the money list.
  2. Set the condition if the counter equals 100.
  3. Finish the program if the counter equals 100.
  4. Add the money iterator to the counter.
  5. Increase the i by 1.
  6. Print the counter.

Lösning

money = [66, 12, 5, 17, 15, 2, 46]
i = 0
counter = 0

# Set the while loop to work with the money list
while i < len(money):
# Set the condition if the counter equals 100
if counter == 100:
# Finish the program
break
else:
# Add the money iterator to the counter
counter += money[i]
# Increase the i by 1
i += 1

# Print the counter
print(counter)

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 6
single

single

money = [66, 12, 5, 17, 15, 2, 46]
i = 0
counter = 0

# Set the while loop to work with the money list
___ i < ___:
# Set the condition if the counter equals 100
if ___ == ___:
# Finish the program
___
else:
# Add the money iterator to the counter
counter += ___[i]
# Increase the i by 1
___ += 1

# Print the counter
print(___)

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