python how to print list of strings with double qu

问题:

I have a list i.e.

my_list = ['a', 'b', 'c', 'd','e','f']

I want to print this out in a pipe or comma delimited format, but because some of my list objects can have commas or pipes, I would like to wrap double quotes around each object when I print

i.e. the output should be

"a"|"b"|"c"|"d"|"e"|"f" rather than a|b|c|d|e|f

i can't use format on my version of python

回答1:

Create a generator that formats each element, then unpack it and use a custom separator. If you are using Python 2, import the print() function first (this can be safely done in Python 3 as well):

>>> from __future__ import print_function
>>> print(*('"{}"'.format(item) for item in my_list), sep='|')
"a"|"b"|"c"|"d"|"e"|"f"

回答2:

Don't do this yourself. You'll trip yourself trying to handle all the corner cases. (What if your fields can have double quotes in them?) Use the csv module instead:

s = StringIO()
writer = csv.writer(s, delimiter="|")
writer.writerow(["a", "b", "c", "d,", "e|", "foo\"bar"])
print i.getvalue()

You get:

a|b|c|d,|"e|"|"foo""bar"

回答3:

>>> "|".join(['"{0}"'.format(x) for x in my_list])
"a"|"b"|"c"|"d"|"e"|"f"

回答4:

>>> print '"' + '"|"'.join(my_list) + '"'
"a"|"b"|"c"|"d"|"e"|"f"