我知道有一些方法可以檢查 str 是否可以使用 try- except 或正則表達(dá)式進(jìn)行轉(zhuǎn)換，但我一直在尋找（例如） str 方法，例如str.isnumeric()str.isdigit()str.isdecimal() # also doesn't work for floats但找不到任何。還有我還沒找到的嗎？
3 回答
慕標(biāo)琳琳
TA貢獻(xiàn)1830條經(jīng)驗(yàn) 獲得超9個(gè)贊
我建議使用 try except 子句請求寬恕而不是許可方法：
str_a = 'foo'
str_b = '1.2'
def make_float(s):
try:
return float(s)
except ValueError:
return f'Can't make float of "{s}"'
>>> make_float(str_a)
Can't make float of "foo"
>>> make_float(str_b)
1.2
www說
TA貢獻(xiàn)1775條經(jīng)驗(yàn) 獲得超8個(gè)贊
Try except 子句的形式如下：
try:
? ? # write your code
? ? pass
except Exception as e: # which can be ValueError, or other's exceptions
? ? # deal with Exception, and it can be called using the variable e
? ? print(f"Exception was {e}") # python >= 3.7
? ? pass
except Exception as e: # for dealing with other Exception
? ? pass
# ... as many exceptions you would need to handle
finally:
? ? # do something after dealing with the Exception
? ? pass
蕭十郎
TA貢獻(xiàn)1815條經(jīng)驗(yàn) 獲得超13個(gè)贊
最簡單的方法就是嘗試將其變成浮動(dòng)。
try:
float(str)
except ValueError:
# not float
else:
# is float
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