【Python：类实例化时出现的问题。】

ABC23

#!/usr/bin/env python3
#filename:pp.py
#coding=utf-8

class People(object):
        #定义基本属性
        name = ''
        age  = 0
        #定义私有属性，私有属性在类外部无法直接访问
        __weight=0
        def __init__(self,n,a,w):
                self.name = n
                self.age = a
                # self.__weight = weight
        def speak(self):
                print("%s 说: 我 %d 岁。" %(self.name,self.age)

p = People("Albert", 18, 120)
p.speak()

-----------------------------------------------------------------------

pydev debugger: starting (pid: 2104)
Traceback (most recent call last):
  File "/Applications/Eclipse.app/Contents/Eclipse/plugins/org.python.pydev.core_6.3.2.201803171248/pysrc/pydevd.py", line 1621, in <module>
    main()
  File "/Applications/Eclipse.app/Contents/Eclipse/plugins/org.python.pydev.core_6.3.2.201803171248/pysrc/pydevd.py", line 1615, in main
    globals = debugger.run(setup['file'], None, None, is_module)
  File "/Applications/Eclipse.app/Contents/Eclipse/plugins/org.python.pydev.core_6.3.2.201803171248/pysrc/pydevd.py", line 1022, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "/Applications/Eclipse.app/Contents/Eclipse/plugins/org.python.pydev.core_6.3.2.201803171248/pysrc/_pydev_imps/_pydev_execfile.py", line 25, in execfile
    exec(compile(contents+"\n", file, 'exec'), glob, loc)
  File "/Users/macbookpro/eclipse-workspace/GrayHatPython/pra011.py", line 18
    p = People("Alex", 100, 120)
    ^
SyntaxError: invalid syntax
--------------------------------------------------------------------------

为什么会报错啊？？！！

ABC23

#!/usr/bin/env python3
#filename:pp.py
#coding=utf-8

class People(object):
    #定义基本属性
    name = ''
    age  = 0
    #定义私有属性，私有属性在类外部无法直接访问
    __weight=0
    def __init__(self,n,a,w):
        self.name = n
        self.age = a
        # self.__weight = weight
    def speak(self):
        print("%s 说: 我 %d 岁。" %(self.name,self.age)

p = People("Alex", 100)
p.speak()

-----------------------------------------------

pydev debugger: starting (pid: 2117)
Traceback (most recent call last):
  File "/Applications/Eclipse.app/Contents/Eclipse/plugins/org.python.pydev.core_6.3.2.201803171248/pysrc/pydevd.py", line 1621, in <module>
    main()
  File "/Applications/Eclipse.app/Contents/Eclipse/plugins/org.python.pydev.core_6.3.2.201803171248/pysrc/pydevd.py", line 1615, in main
    globals = debugger.run(setup['file'], None, None, is_module)
  File "/Applications/Eclipse.app/Contents/Eclipse/plugins/org.python.pydev.core_6.3.2.201803171248/pysrc/pydevd.py", line 1022, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "/Applications/Eclipse.app/Contents/Eclipse/plugins/org.python.pydev.core_6.3.2.201803171248/pysrc/_pydev_imps/_pydev_execfile.py", line 25, in execfile
    exec(compile(contents+"\n", file, 'exec'), glob, loc)
  File "/Users/macbookpro/eclipse-workspace/GrayHatPython/pra011.py", line 18
    p = People("Alex", 100)
    ^
SyntaxError: invalid syntax

----------------------------------------------------

上面发错了。应该是下面这个。大家看下面这个

铁棍阿童木

第一段代码没错啊。

第二段你在实例化的时候少了一个参数。

ABC23

反正就是编译不了。
还请看仔细，是第一个多了一个参数。

ba21

print("%s 说: 我 %d 岁。" %(self.name,self.age))

ABC23

#!/usr/bin/env python3
#filename:pp.py
#coding=utf-8

class People(object):
        #定义基本属性
        name = ''
        age  = 0
        #定义私有属性，私有属性在类外部无法直接访问
        __weight=0
        def __init__(self,n,a,w):
                self.name = n
                self.age = a
                # self.__weight = weight
        def speak(self):
                print("%s 说: 我 %d 岁。" %(self.name,self.age))

p = People("Albert", 18, 120)
p.speak()
-------------------------------------------------
好吧问题不在这（把括号加上后还是编译失败。）

ABC23

好了我知道错在哪里了。我用的是Eclipse，编译环境忘记改成Python3了，，，

tsembrace

ABC23 发表于 2018-3-31 10:20
好了我知道错在哪里了。我用的是Eclipse，编译环境忘记改成Python3了，，，

看5楼，倒数第三行print语句最后少了一个)