在python中处理错误最有效的方式是什么?
我是python新手,我正在尝试处理错误,但我不知道用python处理错误的最有效方法。我试过这种方法,但它似乎有点复杂的理解。我想可能还有其他更好的方式来处理在python中处理错误最有效的方式是什么?,python,error-handling,try-catch,assertion,isinstance,Python,Error Handling,Try Catch,Assertion,Isinstance,我是python新手,我正在尝试处理错误,但我不知道用python处理错误的最有效方法。我试过这种方法,但它似乎有点复杂的理解。我想可能还有其他更好的方式来处理 def set_bit(value, pos, nbits): """ Set bit at position. Keyword Arguments value (int) Bitstring value. pos (int) Position to set bit. nbits
def set_bit(value, pos, nbits):
"""
Set bit at position.
Keyword Arguments
value (int)
Bitstring value.
pos (int)
Position to set bit.
nbits (int)
Number of bits.
"""
if isinstance(value, int):
if value > -1:
# Positives only
if isinstance(pos, int):
if pos > -1:
if isinstance(nbits, int):
if nbits > -1:
return get_bistring(value | 2 ** (pos % nbits), nbits)
else:
raise ValueError(
'"nbits" was set {}, but it must be positive only'
.format(nbits)
)
else:
raise TypeError(
'"nbits" was set {}, but it must be int only'
.format(type(nbits))
)
else:
raise ValueError(
'"pos" was set {}, but it must be positive only'
.format(pos)
)
else:
raise TypeError(
'"pos" was set {}, but it must be int only'
.format(type(pos))
)
else:
raise ValueError(
'"value" was set {}, but it must be positive only'
.format(value)
)
else:
raise TypeError(
'"value" was set {}, but it must be int only'
.format(type(value))
)
你可以试着这样写
import sys
try:
f = open('myfile.txt')
s = f.readline()
i = int(s.strip())
except OSError as err:
print("OS error: {0}".format(err))
except ValueError:
print("Could not convert data to an integer.")
except:
print("Unexpected error:", sys.exc_info()[0])
raise
你可以试着这样写
import sys
try:
f = open('myfile.txt')
s = f.readline()
i = int(s.strip())
except OSError as err:
print("OS error: {0}".format(err))
except ValueError:
print("Could not convert data to an integer.")
except:
print("Unexpected error:", sys.exc_info()[0])
raise
颠倒逻辑以简化代码:
def set_bit(value, pos, nbits):
"""
Set bit at position.
Keyword Arguments
value (int)
Bitstring value.
pos (int)
Position to set bit.
nbits (int)
Number of bits.
"""
if not isinstance(value, int):
raise TypeError('"value" was set {}, but it must be int only'.format(type(value)))
if value < 0:
raise ValueError('"value" was set {}, but it must be positive only'.format(value))
if not isinstance(pos, int):
raise TypeError('"pos" was set {}, but it must be int only'.format(type(pos)))
# and so on...
# once you finish all your checks, then do what you planned to do
由于raise将自动取消函数其余部分的执行,因此条件raise之后的任何代码都可以假定该条件不适用,因此您不需要else语句。颠倒逻辑以简化代码:
def set_bit(value, pos, nbits):
"""
Set bit at position.
Keyword Arguments
value (int)
Bitstring value.
pos (int)
Position to set bit.
nbits (int)
Number of bits.
"""
if not isinstance(value, int):
raise TypeError('"value" was set {}, but it must be int only'.format(type(value)))
if value < 0:
raise ValueError('"value" was set {}, but it must be positive only'.format(value))
if not isinstance(pos, int):
raise TypeError('"pos" was set {}, but it must be int only'.format(type(pos)))
# and so on...
# once you finish all your checks, then do what you planned to do
由于raise将自动取消函数其余部分的执行,因此条件raise之后的任何代码都可以假定该条件不适用,所以您不需要else语句。而不是if-else-go-with-try-exception而不是if-else-go-with-try-exception-but-not-try-catch语句在处理错误时更加复杂?似乎if else语句不是最好的选择。@Átiladisdagamasesilva尽管标题中有“handle”一词,但所写的问题是关于引发异常,而不是捕获异常。但在处理错误时,catch语句是否更具普适性?似乎如果else语句不是最好的选择。@tilaDiasdaGamaeSilva尽管标题中有“handle”一词,但所写的问题是关于引发异常,而不是捕捉异常。