break用于提前退出循環(huán)，continue用于跳過(guò)當(dāng)前迭代。例如，在查找特定值時(shí)用break終止循環(huán)；在過(guò)濾無(wú)效數(shù)據(jù)時(shí)用continue跳過(guò)當(dāng)前項(xiàng)。兩者僅影響所在層級(jí)的循環(huán)，嵌套時(shí)需額外處理外層循環(huán)。合理使用可提升代碼清晰度，但應(yīng)避免濫用。

When you're working with loops in Python (or most programming languages), there are times when you want to either exit the loop early or skip part of the current iteration. That’s where break and continue come in handy.

Using break to Exit a Loop Early

The break statement is used when you want to immediately terminate the loop, no matter how many iterations are left. It’s especially useful when you’re searching for something and want to stop once you find it.

For example:

• You're looping through a list of user inputs and want to stop when you find a specific value.
• You're reading lines from a file and want to exit once you hit an error or end marker.

for number in range(10):
    if number == 5:
        break
    print(number)

In this case, it prints numbers from 0 to 4 and stops because break interrupts the loop when number reaches 5.

You’ll often see break used inside while True loops that wait for a certain condition to occur — like waiting for user input or a network response.

How continue Skips Part of a Loop

If you want to skip just the current iteration and move on to the next one, continue is your go-to. It doesn’t stop the whole loop — it just jumps back to the top and starts the next round.

A common use case:

• Filtering out unwanted values in a list before processing.
• Skipping empty lines or invalid data while parsing files.

for number in range(5):
    if number == 2:
        continue
    print(number)

This will print 0, 1, 3, 4 — skipping 2 entirely.

You can think of continue as a shortcut to avoid nesting too much logic inside conditionals. Instead of writing:

if number != 2:
    do_something()

You can write:

if number == 2:
    continue
do_something()

It keeps your code cleaner, especially when dealing with multiple conditions.

Combining break, continue, and Nested Loops

Sometimes you'll have loops inside other loops — nested loops. In these cases, keep in mind that break and continue only affect the innermost loop they’re in unless you add extra logic to control outer loops.

Here's a simple example:

for i in range(3):
    for j in range(3):
        if j == 1:
            continue
        print(f"i={i}, j={j}")

Only the inner loop is affected by continue. If you need to break out of both loops, you might:

• Use a flag variable
• Refactor into a function with return
• Consider restructuring your logic

Also, be careful not to overuse them — too many breaks and continues can make code harder to follow.

So, break gets you out fast, and continue lets you jump ahead. Both are useful tools, but best used sparingly to keep your loops readable.基本上就這些。

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