什麼是關鍵字?
關鍵字,也叫保留字,就是被編程語言內部定義並保留使用的標識符,不允許開發者自定義和關鍵字名字相同的標識符。
Python中有哪些關鍵字?
Python語言中共有 33 個關鍵字,如下表所示:
and | as | assert |
---|---|---|
break | continue | class |
def | elif | else |
except | finally | for |
from | if | import |
in | is | lambda |
not | or | pass |
raise | return | try |
while | with | yield |
del | global | nonlocal |
True | False | None |
關鍵字是編程語言的基本單詞,大小寫敏感。比如,對於Python而言,as是關鍵字,用作變量名會報錯,而As就可以,示例如下:
示例1:
as = 1
print(as)
報錯結果:
File "<ipython-input-16-33632b1d972b>", line 1
as = 1
^
SyntaxError: invalid syntax
示例2:
As = 1
As - 1
運行結果:
0
好了,以上就是本期內容。
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