I have a huge string that looks like this:
100hello100string100formatting ...
Furthermore, 100 is a dynamic value. In the original string, there are 60 occurrences of 100. How do I format the string so that I can pass the parameter only once?
I am currently doing the following:
"%dhello%dstring%dformatting%d ..." % (100, 100, 100, ...)
Is there any way to pass the value 100 only once so that it will take the same value for all other parameters?
Try string formatting (see also PEP):
"{0}hello{0}string{0}formatting".format(100)
# '100hello100string100formatting'
I suggest using str.join.
If you have 60 occurrences of 100, that also means that you have 60 words in your string. Most likely you got those words from somewhere, for instance from a file, or from a database or from user input.
Assuming that you can get all of those words into a list, why not just join the elements of the list, instead of going to the trouble of typing all the words out?
>>> words = ['hello', 'string', 'formatting']
>>> '100'.join(words)
hello100string100formatting
For this to work, your dynamic value 100 must be a string, so if it's stored as a number, you'll need to convert it first:
>>> num = 100
>>> str(num).join(words)
"%dhello%dstring%dformatting" % (*[100]*3,)
Basically, you create a temp list containing the values you need ([100]), multiply that by how many times you need it (*3) and prepend that with * so that you unpack the list
First create a template string in which you put some special character in place where the dynamic value should be.
Example : ##hello##string##formatting
Then make a function that replace the ## in the string with given parameter using regex.
Code
def getString(value, string) :
newString = string.replace('##', str(value))
return newString
template = '##hello##string##formatting'
replaceHundred = getString(100, template)
replaceTwoHundred = getString(200, template)
.
.
replacedString = getString( anyValue , template)
