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how to concatenate / use strings to execute commands in python / pandas


By : Yoss
Date : October 17 2020, 06:10 AM
it fixes the issue Close, what you need is DataFrame.query, but if need working with Series.isna function add parameter engine='python':
code :
df = pd.DataFrame({
        'A':list('abcdef'),
         'col_1':[np.nan,5,4,5,5,4],
         'C':[7,8,9,4,2,3],
         'col_2':[np.nan,3,5,7,1,np.nan],
         'E':[5,3,6,9,2,4],
         'F':list('aaabbb')
})

print (df)
   A  col_1  C  col_2  E  F
0  a    NaN  7    NaN  5  a
1  b    5.0  8    3.0  3  a
2  c    4.0  9    5.0  6  a
3  d    5.0  4    7.0  9  b
4  e    5.0  2    1.0  2  b
5  f    4.0  3    NaN  4  b

str_a = 'col_1.isna()'

str_b = ' & '

str_c = 'col_2.isna()'

str_tot = str_a + str_b + str_c
print (str_tot)
col_1.isna() & col_2.isna()

print (df.query(str_tot, engine='python'))
   A  col_1  C  col_2  E  F
0  a    NaN  7    NaN  5  a
str_a = '(col_1 != col_1)'

str_b = ' & '

str_c = '(col_2 != col_2)'

str_tot = str_a + str_b + str_c
print (str_tot)
(col_1 != col_1) & (col_2 != col_2)

print (df.query(str_tot))
   A  col_1  C  col_2  E  F
0  a    NaN  7    NaN  5  a


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Execute python commands passed as strings in command line using python -c


By : Leo Castro
Date : March 29 2020, 07:55 AM
Hope that helps For a single string you can use python -c. But for strings as the question asks, you must pass them to stdin:
code :
$ python << EOF
> import sys
> print sys.version
> EOF
2.7.3 (default, Apr 13 2012, 20:16:59) 
[GCC 4.6.3 20120306 (Red Hat 4.6.3-2)]

How to use groupby to concatenate strings in python pandas?


By : mavictoriaatienza
Date : March 29 2020, 07:55 AM
it should still fix some issue I currently have dataframe at the top. Is there a way to use a groupby function to get another dataframe to group the data and concatenate the words into the format like further below using python pandas? , You can apply join on your column after groupby:
code :
df.groupby('index')['words'].apply(','.join)
In [326]:
df = pd.DataFrame({'id':['a','a','b','c','c'], 'words':['asd','rtr','s','rrtttt','dsfd']})
df

Out[326]:
  id   words
0  a     asd
1  a     rtr
2  b       s
3  c  rrtttt
4  c    dsfd

In [327]:
df.groupby('id')['words'].apply(','.join)

Out[327]:
id
a        asd,rtr
b              s
c    rrtttt,dsfd
Name: words, dtype: object

Python Pandas -- Concatenate strings if condition


By : vivek verma
Date : March 29 2020, 07:55 AM
should help you out In a pd.DataFrame I have strings in column A whose len is equal to 5 or 6. If the cell value len(value) == 5 then I need to concatenate the string '7' to the beginning of the cell value. I am currently trying the code below, but cannot seem to use apply with the inplace=True argument. , You can try:
code :
df['A'] = df.A.apply(lambda s: '7' + s if len(s) == 5 else s) 

Python Pandas concatenate strings and numbers into one string


By : Mathieu Buffenoir
Date : March 29 2020, 07:55 AM
this will help I am working with a pandas dataframe and trying to concatenate multiple string and numbers into one string. , Consider the dataframe df
code :
np.random.seed([3,1415])
df = pd.DataFrame(
    np.random.randint(10, size=(3, 3)),
    columns=list('abc')
)

print(df)

   a  b  c
0  0  2  7
1  3  8  7
2  0  6  8
df.astype(str).apply(', '.join, 1)

0    0, 2, 7
1    3, 8, 7
2    0, 6, 8
dtype: object
pd.Series([', '.join(l) for l in df.values.astype(str).tolist()], df.index)

0    0, 2, 7
1    3, 8, 7
2    0, 6, 8
dtype: object

Python Pandas: Groupby Sum AND Concatenate Strings


By : Akinyemi Ajala
Date : March 29 2020, 07:55 AM
Hope that helps Sample Pandas Dataframe: , Let us make it into one line
code :
df.groupby(['ID','Name'],as_index=False).agg(lambda x : x.sum() if x.dtype=='float64' else ' '.join(x))
Out[1510]: 
   ID Name  COMMENT1      COMMENT2  NUM
0   1  dan    hi you  hello friend  3.0
1   2  jon       dog           cat  0.5
2   3  jon  yeah yes       nope no  3.1
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