pythonlisttuplesimmutability

Python: can I modify a Tuple?

I have a 2 D tuple (Actually I thought, it was a list.. but the error says its a tuple) But anyways.. The tuple is of form: (floatnumber_val, prod_id) now I have a dictionary which contains key-> prod_id and value prod_name now.. i want to change the prod_id in tuple to prod_name So this is waht I did

#if prodName is the tuple
# prodDict is the dictionary
for i in range(len(prodName)):
    key = prodName[i][1] # get the prodid
    if prodDict.has_key(key):
        value = prodDict[key]
         prodName[i][1] = value

umm pretty straightforward but i get an error that TypeError: 'tuple' object does not support item assignment

Thanks!!

Solution

  • If prodName is a list of tuples and you want to create a new list of tuples like you explained, you have to create new tuples since a tuple is immutable (i.e. it can not be changed).

    Example:

    for i,(floatnumber_val, prod_id) in enumerate(prodName):
  prodName[i] = (floatnumber_val, prodDict.get(prod_id,prod_id))