CODEWITHSUNDEEP
pythonstring
neversaint
neversaint

Reputation: 64064

How to avoid leading white space while joining string

I have a list of float which I form them into a string with the following method:

import json
a = [1.2, 2.9, 7.4]
str = "\t".join(format(x,"10.3f") for x in a)
print json.dumps(str)

However the final result of str contain leading whitespace like this:

"     1.200\t     2.900\t     7.400"

How can I get this kind of result instead:

"1.200\t2.900\t7.400"

Upvotes: 0

Views: 174

Answers (2)

Zac
Zac

Reputation: 2260

Numbers are padded to 10 characters because of the format you've specified.

Try to use 0 as width specifier to obtain "zero-padding for numeric types":

str = "\t".join(format(x,"0.3f") for x in a)

Have a look at python documentation: https://docs.python.org/2/library/string.html#format-specification-mini-language

Upvotes: 1

Christian Tapia
Christian Tapia

Reputation: 34176

You have to strip (using strip()) the elements of the generator expression:

s = "\t".join(format(x, "10.3f").strip() for x in a)

Demo:

import json
a = [1.2, 2.9, 7.4]
s = "\t".join(format(x, "10.3f").strip() for x in a)
print json.dumps(s) # "1.200\t2.900\t7.400"

Note:

  • Don't use str as the name of a variable because it will hide the built-in implementation of str.

Upvotes: 1

Related Questions