字典：TypeError：在字典中循环时“ bool” /“ nonetype对象”不可迭代

Question

For the following dictionary,

a1 = {'a2':{'name':'mic\xa0\xa0', 'age':'12\xa0\xa0', 'college':True, 'contact':''},
        'a3':{'name':'sen\xa0\xa0', 'age':'23\xa0\xa0','college':True,'contact':''}}

When looping on dictionary and performing some action getting bool object not iterable, if remove the boolean field( college ) from dictionary then error is coming for empty filed( nonetype ( contact ) object not iterable)

def t1():
    a4 = {k : 
    {k2: ''.join([i if 32 < ord(i) < 126 else " " for i in v2])
    for k2, v2 in v.items()} for k, v in a1.items()
    }
    return a4

a5 = t1()
print(a5) 

Any help would be appreciated.

Answer 1

Just make a small change to check if v2 is a string using isinstance() . If it is a string, then iterate and do your operation. Otherwise, return it unchanged.

Example:

def t1():
    a4 = {
        k : {
            k2: ''.join([i if 32 < ord(i) < 126 else " " for i in v2]) 
            if isinstance(v2, str) else v2 for k2, v2 in v.items()  
        } 
        for k, v in a1.items()
    }
    return a4

a5 = t1()

print(a5) 

Output:

{
  "a3": {
    "age": "23  ", 
    "contact": "", 
    "college": True, 
    "name": "sen  "
  }, 
  "a2": {
    "age": "12  ", 
    "contact": "", 
    "college": True, 
    "name": "mic  "
  }
}

You may also want to add in a .strip() to the result of the join() in order to remove leading/trailing whitespace.