I am new to python pandas. I have one dataframe like below:
df = pd.DataFrame({'Name': ['football', 'ramesh','suresh','pankaj','cricket','rakesh','mohit','mahesh'],
'age': ['25', '22','21','32','37','26','24','30']})
print df
Name age
0 football 25
1 ramesh 22
2 suresh 21
3 pankaj 32
4 cricket 37
5 rakesh 26
6 mohit 24
7 mahesh 30
"Name" column contains "sports name" and "sport person name" also. I want to split it into two different columns like below:
Expected Output:
sports_name sport_person_name age
football ramesh 25
suresh 22
pankaj 32
cricket rakesh 26
mohit 24
mahesh 30
If I make groupby on "Name" column I'm not getting expected output and it is obviously straight-forward output because no duplicates in "Name" column. What I need to use so that I can get expected output?
Edit : If don't want to hardcode the sports names
df = pd.DataFrame({'Name': ['football', 'ramesh','suresh','pankaj','cricket','rakesh','mohit','mahesh'],
'age': ['', '22','21','32','','26','24','30']})
df = df.replace('', np.nan, regex=True)
nan_rows = df[df.isnull().T.any().T]
sports = nan_rows['Name'].tolist()
df['sports_name'] = df['Name'].where(df['Name'].isin(sports)).ffill()
d = {'Name':'sport_person_name'}
df = df[df['sports_name'] != df['Name']].reset_index(drop=True).rename(columns=d)
df = df[['sports_name','sport_person_name','age']]
print (df)
I Just Checked for except "Name" column which rows contains NAN values in all rest of the columns and It will be definitely sports names. I created list of that sports names and make use of below solutions to create sports_name and sports_person_name columns.
You can use:
#define list of sports
sports = ['football','cricket']
#create NaNs if no sport in Name, forward filling NaNs
df['sports_name'] = df['Name'].where(df['Name'].isin(sports)).ffill()
#remove same values in columns sports_name and Name, rename column
d = {'Name':'sport_person_name'}
df = df[df['sports_name'] != df['Name']].reset_index(drop=True).rename(columns=d)
#change order of columns
df = df[['sports_name','sport_person_name','age']]
print (df)
sports_name sport_person_name age
0 football ramesh 22
1 football suresh 21
2 football pankaj 32
3 cricket rakesh 26
4 cricket mohit 24
5 cricket mahesh 30
Similar solution with DataFrame.insert
- then reorder is not necessary:
#define list of sports
sports = ['football','cricket']
#rename column by dict
d = {'Name':'sport_person_name'}
df = df.rename(columns=d)
#create NaNs if no sport in Name, forward filling NaNs
df.insert(0, 'sports_name', df['sport_person_name'].where(df['sport_person_name'].isin(sports)).ffill())
#remove same values in columns sports_name and Name
df = df[df['sports_name'] != df['sport_person_name']].reset_index(drop=True)
print (df)
sports_name sport_person_name age
0 football ramesh 22
1 football suresh 21
2 football pankaj 32
3 cricket rakesh 26
4 cricket mohit 24
5 cricket mahesh 30
If want only one value of sport add limit=1
to ffill
and replace NaN
s to empty string:
sports = ['football','cricket']
df['sports_name'] = df['Name'].where(df['Name'].isin(sports)).ffill(limit=1).fillna('')
d = {'Name':'sport_person_name'}
df = df[df['sports_name'] != df['Name']].reset_index(drop=True).rename(columns=d)
df = df[['sports_name','sport_person_name','age']]
print (df)
sports_name sport_person_name age
0 football ramesh 22
1 suresh 21
2 pankaj 32
3 cricket rakesh 26
4 mohit 24
5 mahesh 30
The output you want is a dictionary and not a dataframe. The dictionary will look:
{'Sport' : {'Player' : age,'Player2' : age}}
If you really want a dataframe: If the name always comes before the players:
import pandas as pd
import numpy as np
df = pd.DataFrame({'Name': ['football','ramesh','suresh','pankaj','cricket'
,'rakesh','mohit','mahesh'],
'age': ['25', '22','21','32','37','26','24','30']})
sports=['football', 'cricket']
wanted_dict={}
current_sport=''
for val in df['sport_person_name']:
if val in sports:
current_sport=val
else:
wanted_dict[val]=current_sport
#Now you got - {name:sport_name,...}
df['sports_name']=999
for val in df['sport_person_name']
df['sports_name']=np.where((val not in sports)&
(df['sport_person_name']==val),
wanted_dict[val],'sport)
df = df[df['sports_name']!='sport']
What it should look like:
sports_name sport_person_name age
football ramesh 25
football suresh 22
football pankaj 32
cricket rakesh 26
cricket mohit 24
cricket mahesh 30
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