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我在编码,并且在一部分中出现错误。 但我无法找到错误发生的原因。NameError:名称'self'未定义IN EXEC/EVAL
代码(样本;类似的错误部分):
class Test:
def __init__(self,a=0):
self.x = a
self.l = [2**x for x in range(a)] #<--- self.l = [1,2,4,8,16]
self.base()
def base(self):
expr = "self.l{0} = [self.l[x]+{0} for x in range(self.x)]" #<--- when i=4, self.l4 = [5,6,8,12,20]
for i in range(self.x):
exec(expr.format(i))
w = Test(5)
print(w.l4)
所以我认为我得到这个:
[5, 6, 8, 12, 20]
,但
File "D:/Documents and Settings/Desktop/py/py/test2.py", line 12, in <module>
w = Test(5)
File "D:/Documents and Settings/Desktop/py/py/test2.py", line 5, in __init__
self.base()
File "D:/Documents and Settings/Desktop/py/py/test2.py", line 10, in base
exec(expr.format(i))
File "<string>", line 1, in <module>
File "<string>", line 1, in <listcomp>
NameError: name 'self' is not defined
(对不起,坏英文)