python replace first occurrence in string
# string replace() function perfectly solves this problem:
# string.replace(s, old, new[, maxreplace])
# Return a copy of string s with all occurrences of substring old replaced
# by new. If the optional argument maxreplace is given, the first maxreplace
# occurrences are replaced.
>>> u'longlongTESTstringTEST'.replace('TEST', '?', 1)
u'longlong?stringTEST'python find second occurrence in string
# find index of second occurence of substring in string
idx = string.find(substring, string.find(substring) + 1)python find first occurrence in list
#iterate through list
for item in yourlist:
#if item is equal to a value
if item == 'value':
#store the item in a variable
yourvar = item
#break out of loop
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