Using pickle module to write to file gives error

[ckpkhill]

import pickle
f = open("filepath/test.txt","w")
f.write(" writing to a output file") # works
pickle.dump([1,2,3],f) # fails with error "TypeError: write() argument must be str, not bytes"
f.close()

Is pickle module not meant to overcome the issue of having to convert to string before writing to a file?