Backlash error. Pandas filter dataframe using dynamic query string.

Question

Hi all, The problem is related to the Python backlash error. I am creating a dynamic query string for filtering in pandas. The code is:

Answer 1

Consider the following approach:

In [44]: filters
Out[44]:
           col          val
0  wlbWellType  EXPLORATION
1          bbb          BBB

In [45]: qry = filters['col'].add(' == "').add(filters['val']).add('"').str.cat(sep=' & ')

In [46]: print(qry)
wlbWellType == "EXPLORATION" & bbb == "BBB"

slightly different syntax:

In [50]: qry = (filters['col'] + ' == "' + filters['val'] + '"').str.cat(sep=' & ')

In [51]: qry
Out[51]: 'wlbWellType == "EXPLORATION" & bbb == "BBB"'