如何在字典键值pai中传递带参数的函数

Question

我对python不熟悉，正试图创建一个以值为函数的字典。这是我的密码

import os

class Foo():
    def print1(self,n):
        print 5


    def print2(self,n):
        print 6

    def foo(self):
        bar = {'a': self.print1, 'b': self.print2}
        bar['b'](5)
        bar['a'](3)
        bar[os.environ['FOO']]()


f = Foo()
f.foo()

Traceback (most recent call last):
  File "test_dict.py", line 17, in <module>
   f.foo()
  File "test_dict.py", line 13, in foo
    bar[b]()

python test_dict.py 
6 
5  
   Traceback (most recent call last):
      File "test_dict.py", line 19, in <module>
       f.foo()
      File "test_dict.py", line 15, in foo
       bar[os.environ['FOO']]()
    TypeError: print2() takes exactly 2 arguments (1 given)

Answer 1

请尝试以下代码：

class Foo():
    def print1(self,n):
        print 6

    def print2(self,n):
        print n

    def foo(self):
        bar = {'a': self.print1, 'b': self.print2 }
        bar['b'](5)
        bar['a'](3)

f = Foo()
f.foo()

它做你想做的。在