需要帮助创建 Python 类

Question

I need some help with creating a python class and method. I don't really know what I am doing wrong but I keep getting the correct answer and then this error: <__main__.stringToMerge object at 0x7f9161925fd0>

I want to create an object with two string that merges them alternatively. For example the object would be obj.s1="aaaaa" , obj.s2="bb" and the correct output would be: "ababaaa" .

Ty in advance for any help provided :D

class stringToMerge:
  def __init__(self, string1, string2):
    self.string1 = string1
    self.string2 = string2

  def SM(self, string1, string2):
    self.string1 = string1
    self.string2 = string2
    string3 = ""
    i = 0
    while i<len(string1) and i<len(string2):
      string3 = string3+string1[i]
      string3 = string3+string2[i]
      i = i+1
    while i<len(string1):
      string3 = string3+string1[i]
      i = i+1
    while i<len(string2):
      string3 = string3+string1[i]
      i = i+1  
    print(string3)


obj = stringToMerge('aaaaa', 'bb')
obj.SM(obj.string1, obj.string2)
print(obj) 

Answer 1

Already your code is printing the expected output. But additionally you are getting this message <__main__.stringToMerge object at 0x7f9161925fd0> because you are printing the instance of the class print(obj) . Comment or remove this line you won't find this again.

Answer 2

Your main Issue was that you were not returning anything and you were trying to print the object. Hence the reason it printed out < main .stringToMerge object at 0x7f9161925fd0>. In the snippet below I edited the code to be more concise, and I added a return statement to the function. Once this was done, I assigned a variable to the return value of the SM() method and printed said variable

class stringToMerge:
  def __init__(self, string1, string2):
    self.string1 = string1
    self.string2 = string2
  def longestString(string1,string2):
      if len(string1) < len(string2):
          return string2
      else:
          return string1
  def SM(self, string1, string2):
    string3 = ""
    i = 0
    for char1,char2 in zip(string1, string2):
        string3 += char1+char2
        i+= 1
    longestString = stringToMerge.longestString(string1,string2)
    return string3+longestString[i:]

obj = stringToMerge('aaaaa', 'bb')
final = obj.SM(obj.string1, obj.string2)
print(final)