Amaran dalam Python

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Amaran ialah mesej amaran yang pada dasarnya tidak menimbulkan pengecualian dan tidak menamatkan program.

Terdapat kategori amaran seperti yang ditunjukkan di bawah:

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() boleh berlaku secara manual amaran seperti yang ditunjukkan di bawah:

*Memo:

• Argumen pertama ialah mesej(Jenis Diperlukan:str).
• Argumen ke-2 ialah kategori(Pilihan-Lalai:Tiada-Jenis:Amaran). *Jika Tiada, Amaran Pengguna ditetapkan kepadanya.
• Argumen ke-3 ialah stacklevel(Optional-Default:1-Type:int). *Ia menentukan kod yang dirujuk oleh amaran.
• Argumen ke-4 ialah sumber(Pilihan-Lalai:Tiada-Jenis:Mana-mana).
• Terdapat argumen skip_file_prefixes(Optional-Default:None-Type:tuple of str): *Memo:
  • skip_file_prefixes= mesti digunakan.
  • Menetapkan Tiada padanya secara manual mendapat ralat.

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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