"block"在Python3中是什么意思？

Question

我是编程新手，正在尝试向 automatetheboringstuff.com 学习 Python。在第 2 章的末尾，出现了以下问题。甚至在我已经通过官方答案之后，我仍然一无所知。请帮忙！

Q:8. Identify the three blocks in this code:

spam = 0
if spam == 10:
    print('eggs')
    if spam > 5:
        print('bacon')
    else:
        print('ham')
    print('spam')
print('spam')

官方回答：

The three blocks are everything inside the if statement and the lines print('bacon') and print('ham').
print('eggs')
if spam > 5:
    print('bacon')
else:
    print('ham')
print('spam')

Answer 1

每次增加一行的缩进都会开始一个新的块，并在相应的取消缩进之前结束。

spam = 0
if spam == 10:
    print('eggs')        # indent increased, block A
    if spam > 5:         # still block A
        print('bacon')   # still block A, indent increased, block B inside block A
    else:                # still block A, indent decreased, block B ended in line above
        print('ham')     # still block A, indent increased, block C inside block A
    print('spam')        # still block A, indent decreased, block C ended in line above
print('spam')            # indent decreased, block A ended in line above

"block"在Python3中是什么意思？

What does "block" mean in Python 3?

python

indentation