为什么Python的eval()拒绝这个多行字符串，我如何修复它?

I am attempting to eval the following tab-indented string:

我正在尝试计算下面的表缩进字符串:

'''for index in range(10):
        os.system("echo " + str(index) + "")
'''

I get, "There was an error: invalid syntax , line 1"

我得到"有一个错误，无效语法，第1行"

What is it complaining about? Do I need to indent to match the eval() statement, or write it to a string file or temp file and execute that, or something else?

它在抱怨什么?我是否需要缩进来匹配eval()语句，或者将它写到字符串文件或临时文件中并执行它，或者其他什么?

Thanks,

谢谢,

4 个解决方案

#1

eval evaluates stuff like 5+3

eval的值是5+3

exec executes stuff like for ...

exec执行诸如…

>>> eval("for x in range(3):print x")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1
    for x in range(3):print x
      ^
SyntaxError: invalid syntax
>>> exec("for x in range(3):print x")
0
1
2
>>> eval('5+3')
8

4 个解决方案

#1

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