python - formatted output to an external txt file - 


fp = open ('data.txt','r') saveto = open('backup.txt','w') someline = fp.readline() savemodfile = '' while someline :     temp_array = someline.split()     print('temp_array[1] {0:20} temp_array[0] {0:20}'.format(temp_array[1], temp_array[0]), '\trating:', temp_array[len(temp_array)-1]))     someline = fp.readline()     savemodfile =  temp_array[1] + '  ' + temp_array[0] +',\t\trating:'+ temp_array[10]     saveto.write(savemodfile + '\n') fp.close() saveto.close()

the input file :data.txt has records of pattern: firstname lastname age address

i backup.txt has format: lastname firstname address age

how store data in backup.txt in nice formatted way? think should use format() method somehow...

i use print object in code show understood format() far. of course, not desired results.

to answer question: can indeed use .format() method on string template, see documentation https://docs.python.org/3.5/library/stdtypes.html#str.format

for example:

'the first parameter {}, second parameter {}, third 1 {}'.format("this one", "that one", "there")

will output: 'the first parameter one, second parameter one, third 1 there'

you not seem use format() in case: 'temp_array[1] {0:20} temp_array[0] {0:20}'.format(temp_array[1], temp_array[0]) output 'temp_array[1] lastname temp_array[0] lastname '. because {0:20} output 1st parameter format(), right padded spaces 20 characters.

additionally, there many things improved in code. guess learning python that's normal. here functionally equivalent code produces output want, , makes use of python features , syntax: 

with open('data.txt', 'rt') finput, \      open('backup.txt','wt') foutput:     line in finput:         firstname, lastname, age, address = line.strip().split()         foutput.write("{} {} {} {}\n".format(lastname, firstname, address, age)

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