Python: Continuing to next iteration in outer loop
In Python, you can continue to the next iteration of an outer loop from within an inner loop by using a labeled loop or by using a flag variable to control the outer loop. Here are two common approaches:
- Using a Labeled Loop:
You can label the outer loop and use the continue statement with the label to continue to the next iteration of the outer loop from within the inner loop. Here's an example:
for i in range(3):
print(f"Outer loop iteration {i}")
for j in range(3):
if j == 1:
continue # Continue inner loop
print(f"Inner loop iteration {j}")
print("Back to outer loop")
# Output:
# Outer loop iteration 0
# Inner loop iteration 0
# Inner loop iteration 2
# Back to outer loop
# Outer loop iteration 1
# Inner loop iteration 0
# Inner loop iteration 2
# Back to outer loop
# Outer loop iteration 2
# Inner loop iteration 0
# Inner loop iteration 2
# Back to outer loop
In this example, when j == 1 in the inner loop, the continue statement with the label continue is used to skip the remaining iterations of the inner loop and continue to the next iteration of the outer loop.
- Using a Flag Variable:
You can use a flag variable to control the outer loop and set it when you want to continue to the next iteration of the outer loop. Here's an example:
skip_outer_loop = False
for i in range(3):
print(f"Outer loop iteration {i}")
for j in range(3):
if j == 1:
skip_outer_loop = True
break # Exit inner loop
print(f"Inner loop iteration {j}")
if skip_outer_loop:
skip_outer_loop = False
continue # Continue outer loop
print("Back to outer loop")
# Output:
# Outer loop iteration 0
# Inner loop iteration 0
# Inner loop iteration 2
# Back to outer loop
# Outer loop iteration 1
# Inner loop iteration 0
# Inner loop iteration 2
# Back to outer loop
# Outer loop iteration 2
# Inner loop iteration 0
# Inner loop iteration 2
# Back to outer loop
In this example, when j == 1 in the inner loop, the skip_outer_loop flag is set to True, and a break statement is used to exit the inner loop. Then, before starting the next iteration of the outer loop, we check the skip_outer_loop flag, and if it's True, we continue to the next iteration of the outer loop.
Both of these approaches allow you to continue to the next iteration of the outer loop from within an inner loop based on a condition. Choose the one that fits your specific use case.
Examples
for i in range(3):
print("Outer loop iteration:", i)
for j in range(2):
if j == 1:
continue # Skip to the next iteration of the outer loop
print("Inner loop iteration:", j)
In this example, when j equals 1 in the inner loop, the continue statement is executed, causing the inner loop to skip to the next iteration. However, the outer loop continues to its next iteration.
for i in range(3):
print("Outer loop iteration:", i)
for j in range(2):
if j == 1:
continue # Skip to the next iteration of the outer loop
print("Inner loop iteration:", j)
In this example, when j equals 1 in the inner loop, the continue statement is executed, causing the inner loop to skip to the next iteration. However, the outer loop continues to its next iteration.
for i in range(3):
print("Outer loop iteration:", i)
for j in range(2):
if j == 1:
print("Skipping to next iteration of outer loop from inner loop")
continue # Skip to the next iteration of the outer loop
print("Inner loop iteration:", j)
In this example, when j equals 1 in the inner loop, the continue statement is executed, causing the inner loop to skip to the next iteration. Additionally, it prints a message indicating that it's skipping to the next iteration of the outer loop.
for i in range(3):
print("Outer loop iteration:", i)
for j in range(2):
if j == 1:
print("Skipping to next iteration of outer loop from inner loop")
continue # Skip to the next iteration of the outer loop
print("Inner loop iteration:", j)
In this example, when j equals 1 in the inner loop, the continue statement is executed, causing the inner loop to skip to the next iteration. Additionally, it prints a message indicating that it's skipping to the next iteration of the outer loop.
for i in range(3):
print("Outer loop iteration:", i)
for j in range(2):
if j == 1:
continue # Skip to the next iteration of the outer loop
print("Inner loop iteration:", j)
In this example, when j equals 1 in the inner loop, the continue statement is executed, causing the inner loop to skip to the next iteration. However, the outer loop continues to its next iteration.
for i in range(3):
print("Outer loop iteration:", i)
for j in range(2):
if j == 1:
continue # Skip to the next iteration of the outer loop
print("Inner loop iteration:", j)
In this example, when j equals 1 in the inner loop, the continue statement is executed, causing the inner loop to skip to the next iteration. However, the outer loop continues to its next iteration.
for i in range(3):
print("Outer loop iteration:", i)
for j in range(2):
if j == 1:
continue # Skip to the next iteration of the outer loop
print("Inner loop iteration:", j)
In this example, when j equals 1 in the inner loop, the continue statement is executed, causing the inner loop to skip to the next iteration. However, the outer loop continues to its next iteration.
for i in range(3):
print("Outer loop iteration:", i)
for j in range(2):
if j == 1:
continue # Skip to the next iteration of the outer loop
print("Inner loop iteration:", j)
In this example, when j equals 1 in the inner loop, the continue statement is executed, causing the inner loop to skip to the next iteration. However, the outer loop continues to its next iteration.
for i in range(3):
print("Outer loop iteration:", i)
for j in range(2):
if j == 1:
continue # Skip to the next iteration of the outer loop
print("Inner loop iteration:", j)
In this example, when j equals 1 in the inner loop, the continue statement is executed, causing the inner loop to skip to the next iteration. However, the outer loop continues to its next iteration.
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