Renaming Substring In Column Names With Dictionary

I hope someone can help. I need to replace part of all column names present in a dataframe using a dictionary shown below. I need to replace the first part (e.g. 'z987') with the r

Solution 1:

You can do

df1.columns = [y.replace(x, dic[x]) for x in dic.keys() for y in df.columns if x in y]

Essentially, you can iterate over the keys of dictionary and the columns of dataframe and replace the substring with value of the dictionary. Now you can reassign the columns of df1