python - Replacing one column in a file with other values -

i have file this:

1  0 1  0 1  0 2  0 2  0 2  0 3  0 3  0 3  0 3  0  3  0 4  0 5  0 

and file, file2 1 column:

0.122 0.133 0.855 -2.1 -9.00 

i want replace second column of file 1 data file2 such output file becomes this:

1  0.122 1  0.122 1  0.122 2  0.133 2  0.133 2  0.133 3  0.855 3  0.855 3  0.855 3  0.855 3  0.855 4  -2.1 5  -9 

in other words, want copy data second file first until first column value remains same. when value in first column changes, picks second value other file.

i have been trying in python , have been able replace column not meet repetitions desired number of times. code copies data first 5 positions of column2 in first file , leaves rest. can suggest solution please?

it better see code might logic tweaked (it doesn't write original file , assumes second file has enough lines):

f1 = open('file1.txt', 'r') f2 = open('file2.txt', 'r')  oldf1value = none v = none  l1 in f1:     [c1, c2] = l1.split()     if (oldf1value != c1):         oldf1value = c1         v = f2.readline().splitlines()[0]      print(c1, v)  f1.close() f2.close()