I'm trying to create a loop to populate a **dictionary within a dictionary** from a **Series**:  

The expected result is:

```
{1: {'KEY Mult. by 10': 10, 'KEY Add by 10': 11},
 2: {'KEY Mult. by 10': 20, 'KEY Add by 10': 12},
 3: {'KEY Mult. by 10': 30, 'KEY Add by 10': 13},
 4: {'KEY Mult. by 10': 40, 'KEY Add by 10': 14},
 5: {'KEY Mult. by 10': 50, 'KEY Add by 10': 15}}

```

what I'm doing is:

```
series_1 = pd.Series([1,2,3,4,5])

first_dict = dict()                         # creating first level of Dict 
second_dict = dict({'KEY Mult. by 10': 0,   # creating second level of Dict
                   'KEY Add by 10': 0})

for i in series_1:

    first_dict[i] = second_dict

    first_dict[i]['KEY Mult. by 10'] = i *10
    first_dict[i]['KEY Add by 10'] = i + 10

```

The result from the above ends up being:

```
{1: {'KEY Mult. by 10': 50, 'KEY Add by 10': 15},
 2: {'KEY Mult. by 10': 50, 'KEY Add by 10': 15},
 3: {'KEY Mult. by 10': 50, 'KEY Add by 10': 15},
 4: {'KEY Mult. by 10': 50, 'KEY Add by 10': 15},
 5: {'KEY Mult. by 10': 50, 'KEY Add by 10': 15}}

```

Then, when I try to change value for one of the keys, it changes for all of them:

```
first_dict[3]['KEY Mult. by 10'] = 20

print(first_dict)

{1: {'KEY Mult. by 10': 20, 'KEY Add by 10': 15},
 2: {'KEY Mult. by 10': 20, 'KEY Add by 10': 15},
 3: {'KEY Mult. by 10': 20, 'KEY Add by 10': 15},
 4: {'KEY Mult. by 10': 20, 'KEY Add by 10': 15},
 5: {'KEY Mult. by 10': 20, 'KEY Add by 10': 15}}

```

Can any one help me please?