由于某种原因，当我跑步时
import sys
from fractions import Fraction
for i, j in zip(["a","b","c","d","e","f"], range(1,6)):
eval("{0} = int(sys.argv[{1}])".format(i, j))
if a*d != c*b:
x = (e*d-b*f)/(a*d-c*b)
y = (a*f-c*e)/(a*d-c*b)
print "x = ", x , ", y = ", y
elif e*d-b*f == 0 and a*f-e*c == 0:
print "Infinite solutions"
print "Slope = ", Fraction(-a,b), ", Y-Intercept = ", Fraction(e,b)
else:
print "No solution"
使用python2 py.py 1 3 3 9 5 15，它给我以下错误
Traceback (most recent call last):
File "py.py", line 4, in <module>
eval("{0} = int(sys.argv[{1}])".format(i, j))
File "<string>", line 1
a = int(sys.argv[1])
^
SyntaxError: invalid syntax
有什么想法为什么会这样？我确定这是有效的语法，但也许eval搞砸了？
这是的不必要使用eval。您的代码：
for i, j in zip(["a","b","c","d","e","f"], range(1,6)):
eval("{0} = int(sys.argv[{1}])".format(i, j))
可以更好地表示为：
a, b, c, d, e, f = map(int, sys.argv[1:7])
或为：
a, b, c, d, e, f = (int(x) for x in sys.argv[1:7])
[请注意，原始代码的范围错误，应为range（1,7）]
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