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[英]'<' not supported between instances of 'NoneType' and 'NoneType' error in python
[英]'>' not supported between instances of 'NoneType' and 'NoneType' Overlapping Check
您好,我在驗證檢查中收到此錯誤
def sefl(clean):
start_number=self.cleaned_data.get("start_number",None)
end_number=self.cleaned_data.get("end_number",None)
latest_start=max(start_number, end_number)
earliest_end = min(start_number, end_number)
delta = (earliest_end - latest_start) + 1
if delta is None:
raise ValidationError("overlap not allowed")
您將需要捕獲正在創建的 none 值,如下所示:
def sefl(clean):
start_number = self.cleaned_data.get("start_number", None)
end_number = self.cleaned_data.get("end_number", None)
if start_number is not None and end_number is not None:
latest_start=max(start_number, end_number)
earliest_end = min(start_number, end_bbch)
delta = (earliest_end - latest_start) + 1
if delta is None:
raise ValidationError("overlap not allowed")
else:
raise ValidationError("start_number and end_number are required")
這是因為您將兩個變量的默認值都定義為None
。 如果在max
或min
進行比較時,其中至少有一個實際上是None
,則會出現您遇到的問題。
如果您有興趣,有幾種方法可以解決這個問題。 例如,如果有合適的值,您可以使用不同的默認值而不是None
。
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