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Eine Warnung ist eine Warnmeldung, die grundsätzlich keine Ausnahme auslöst und das Programm nicht beendet.
Es gibt Warnkategorien wie unten gezeigt:
Class | Disposition |
---|---|
Warning | This is the base class of all warning category classes. It is a subclass of Exception. |
UserWarning | The default category for warn(). |
DeprecationWarning | Base category for warnings about deprecated features when those warnings are intended for other Python developers (ignored by default, unless triggered by code in __main__). |
SyntaxWarning | Base category for warnings about dubious syntactic features. |
RuntimeWarning | Base category for warnings about dubious runtime features. |
FutureWarning | Base category for warnings about deprecated features when those warnings are intended for end users of applications that are written in Python. |
PendingDeprecationWarning | Base category for warnings about features that will be deprecated in the future (ignored by default). |
ImportWarning | Base category for warnings triggered during the process of importing a module (ignored by default). |
UnicodeWarning | Base category for warnings related to Unicode. |
UnicodeWarning | Base category for warnings related to Unicode. |
BytesWarning | Base category for warnings related to bytes and bytearray. |
ResourceWarning | Base category for warnings related to resource usage (ignored by default). |
warn() kann manuell eine Warnung ausgeben, wie unten gezeigt:
*Memos:
import warnings warnings.warn(message="This is a warning.") # UserWarning: This is a warning. # warnings.warn(message="This is a warning.") warnings.warn(message="This is a warning.", category=None, stacklevel=1, source=None, skip_file_prefixes=()) # UserWarning: This is a warning. # warnings.warn(message="This is a warning.", warnings.warn(message="This is a warning.", category=Warning) # Warning: This is a warning. # warnings.warn(message="This is a warning.", warnings.warn(message="This is a warning.", category=DeprecationWarning) # DeprecationWarning: This is a warning. # warnings.warn(message="This is a warning.", def test1(): warnings.warn(message="Warning 1", stacklevel=-100) warnings.warn(message="Warning 2", stacklevel=0) warnings.warn(message="Warning 3", stacklevel=1) warnings.warn(message="Warning 4", stacklevel=2) warnings.warn(message="Warning 5", stacklevel=3) warnings.warn(message="Warning 6", stacklevel=4) warnings.warn(message="Warning 7", stacklevel=5) warnings.warn(message="Warning 8", stacklevel=100) def test2(): test1() def test3(): test2() test3() # UserWarning: Warning 1 # warnings.warn(message="Warning 1", # UserWarning: Warning 2 # warnings.warn(message="Warning 2", # UserWarning: Warning 3 # warnings.warn(message="Warning 3", # UserWarning: Warning 4 # test1() # UserWarning: Warning 5 # test2() # UserWarning: Warning 6 # test3() # UserWarning: Warning 7 # exec(code_obj, self.user_global_ns, self.user_ns) # UserWarning: Warning 8
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