Counting Occurrences by ROW in Python Pandas

Question

Lets say I have a dataframe that looks like this:

      Select a BW Speed      Router Name  router_max OK or REPLACE?     Firewall Name  firewall_max OK or REPLACE?
0                     50           XYZ        30.0        REPLACE               X          30.0        REPLACE
1                     50           XYZ        30.0        REPLACE               X           NaN            N/A
2                     50           XYZ        30.0        REPLACE               X          30.0        REPLACE

I need an additional column that shows the number of times "REPLACE" occurs in that row (in this case it is the total number of items that need to be replaced).

Any help would be appreciated...I know this is probably pretty basic stuff.

Answer 1

df['new_column'] = df.apply(lambda x: x.str.contains("REPLACE").sum(), axis=1)

Answer 2

using stack and groupby with str_contains to avoid using apply.

df["replace_check"] = (
    df.stack().to_frame()[0].str.contains("REPLACE").groupby(level=0).sum()
)

---

print(df)

       Select a BW Speed  Router Name   router_max OK or REPLACE?    \
0                       50         XYZ         30.0          REPLACE   
1                       50         XYZ         30.0          REPLACE   
2                       50         XYZ         30.0          REPLACE   

     Firewall Name   firewall_max  OK or REPLACE?  replace_check  
0                 X           30.0        REPLACE            2.0  
1                 X            NaN            N/A            1.0  
2                 X           30.0        REPLACE            2.0