CODEWITHSUNDEEP
pythonconcatenationstringiocstringio
ThorSummoner
ThorSummoner

Reputation: 18139

python how to concat stringio objects?

Because I don't want to get into passing variables into a function that modifies its input variables; I have a couple of functions that return new StringIO.StringIO() objects, with some text output each. I want to concatenate these outputs together into one long stringio object.

Given functions report1 and report2 that return new populated StringIO objects, how would you concatenate them?

Upvotes: 4

Views: 9046

Answers (2)

ThorSummoner
ThorSummoner

Reputation: 18139

Discrete concatenation of a set of io objects

loop and join their values together:

main_output = StringIO.StringIO()

outputs = list()
outputs.append(report1())
outputs.append(report2())

main_output.write(''.join([i.getvalue() for i in outputs]))

Continually

Know that your getting stringio objects, get their sting value and immediately write it to your main stringio object.

main_output = StringIO.StringIO()

main_output.write(report1().getvalue())
main_output.write(report2().getvalue())

Upvotes: 4

K Raphael
K Raphael

Reputation: 851

You can also write one StringIO into the other

In [58]: master_io = StringIO()

In [59]: temp_io = StringIO()

In [60]: temp_io.write("one,two,three\n")

In [61]: temp_io.reset()

In [62]: master_io.write(temp_io.read())

In [63]: master_io.reset()

In [64]: master_io.read()
Out[64]: 'one,two,three\n'

In [65]: temp_io.reset()

In [66]: temp_io.truncate()

In [68]: temp_io.write('four,five,six\n')

In [69]: temp_io.reset()

In [70]: master_io.write(temp_io.read())

In [71]: master_io.reset()

In [72]: master_io.read()
Out[72]: 'one,two,three\nfour,five,six\n'

Upvotes: 2

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