PYTHON

python search first occurrence in string

s = "the dude is a cool dude"
s.find('dude') # returns 4 - the first index of the first match in the string

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
        break