format phone number in csv using pandas

Question

Python/pandas n00b. I have code that is processing event data stored in csv files. Data from df[\"CONTACT PHONE NUMBER\"] is outputting the phone number as `5555551

Answer 1

I think the problem is that the phone numbers are stored as float64, so, adding a few things will fix your inner loop:

In [75]:

df['Phone_no']
Out[75]:
0    5554443333
1    1114445555
Name: Phone_no, dtype: float64
In [76]:

for phone_no in df['Phone_no']:
    contactphone = "(%c%c%c)%c%c%c-%c%c%c%c" % tuple(map(ord,list(str(phone_no)[:10])))
    print contactphone
(555)444-3333
(111)444-5555

However, I think it is easier just to have the phone numbers as string (@Andy_Hayden made a good point on missing values, so I made up the following dataset:)

In [121]:

print df
     Phone_no   Name
0  5554443333   John
1  1114445555   Jane
2         NaN  Betty

[3 rows x 2 columns]
In [122]:

df.dtypes
Out[122]:
Phone_no    float64
Name         object
dtype: object
#In [123]: You don't need to convert the entire DataFrame, only the 'Phone_no' needs to be converted.
#
#df=df.astype('S4')
In [124]:

df['PhoneNumber']=df['Phone_no'].astype(str).apply(lambda x: '('+x[:3]+')'+x[3:6]+'-'+x[6:10])
In [125]:

print df
       Phone_no   Name    PhoneNumber
0  5554443333.0   John  (555)444-3333
1  1114445555.0   Jane  (111)444-5555
2           NaN  Betty         (nan)-

[3 rows x 3 columns]

---

In [134]:
import numpy as np
df['PhoneNumber']=df['Phone_no'].astype(str).apply(lambda x: np.where((len(x)>=10)&set(list(x)).issubset(list('.0123456789')),
                                                                      '('+x[:3]+')'+x[3:6]+'-'+x[6:10],
                                                                      'Phone number not in record'))
In [135]:

print df
     Phone_no   Name                 PhoneNumber
0  5554443333   John               (555)444-3333
1  1114445555   Jane               (111)444-5555
2         NaN  Betty  Phone number not in record

[3 rows x 3 columns]