CODEWITHSUNDEEP
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Reputation: 11

Why do I get a parentheses when writing text to a file?

for node in tree.getiterator('TARGET'):
    tgt_name = node.attrib.get('NAME')
    print map_name, ",", "TARGET" , ", " , tgt_name
    tgt_name_str = map_name, ",", "TARGET" , ", " , tgt_name
    writer.writelines (str(tgt_name_str))
    writer.writelines('\n')

Here is the output file content:

('m_myname', ',', 'TARGET', ', ', 'mytable')

In the above the parentheses is also written as part of the text file, but I don't that. Any idea how to remove this parentheses getting written to a file?

Upvotes: 1

Views: 1698

Answers (5)

Spycho
Spycho

Reputation: 7788

tgt_name_str = map_name, ",", "TARGET" , ", " , tgt_name creates a tuple, the string representation of which is surrounded by parenthesis.

Others have suggested ''.join([map_name, ",", "TARGET" , ", " , tgt_name]), but you could do ', '.join([map_name, "TARGET", tgt_name]). The join will put the ', ' in between the elements of the supplied array. Note that this may differ from your desired output as in your code, there's no space after the first comma but there is after the second. Is that intentional?

Upvotes: 0

mavnn
mavnn

Reputation: 9469

If you assign multiple values to a single variable, as in:

tgt_name_str = map_name, ",", "TARGET" , ", " , tgt_name

Python will implicitly convert that into a tuple. It's equivalent to writing:

tgt_name_str = (map_name, ",", "TARGET" , ", " , tgt_name)

and so that is what str(tgt_name_str) supplies.

You might want to concatenate the values:

tgt_name_str = map_name + "," + "TARGET" + ", " + tgt_name

, use ''.join or create your own format template to get the output you desire.

Upvotes: 0

Simon Bergot
Simon Bergot

Reputation: 10592

because tgt_name_str = map_name, ",", "TARGET" , ", " , tgt_name is a tuple.

replace by:

tgt_name_str = ''.join([map_name, ",", "TARGET" , ", " , tgt_name])
# or
tgt_name_str = map_name + "," + "TARGET" + ", " + tgt_name

Upvotes: 0

Björn Pollex
Björn Pollex

Reputation: 76856

This line:

tgt_name_str = map_name, ",", "TARGET" , ", " , tgt_name

creates a tuple, and the string representation of a tuple is enclosed in parenthesis. To do what you want, use this:

writer.write("{0}, TARGET, {1}\n".format(map_name, tgt_name))

Upvotes: 2

Artsiom Rudzenka
Artsiom Rudzenka

Reputation: 29121

This is because when you execute next line:

tgt_name_str = map_name, ",", "TARGET" , ", " , tgt_name

tgt_name_str will contain a tuple, so when you call str(tgt_name_str) it gives you data with paranthesis.

To check this you can simply add statement with print type(tgt_name_str).

So to fix it you can use join:

tgt_name_str = ''.join([map_name, ",", "TARGET" , ", " , tgt_name])

OR:

for node in tree.getiterator('TARGET'):
    tgt_name = node.attrib.get('NAME')
    writer.writelines (''.join([map_name, ",", "TARGET" , ", " , tgt_name, '\n']))

Upvotes: 1

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