Python Add to Object Attribute

[LtStaffel]

Hello,

 

Simple question: How can I add 1 to the already integer value attribute of my object in Python? (In essence execute object.attribute += 1)

 

Thanks in advance!

-LtStaffel

[fizzlesticks]

What's wrong with object.attribute += 1?

 

[LtStaffel]

38 minutes ago, fizzlesticks said:

What's wrong with object.attribute += 1?

 

Traceback (most recent call last):
  File "I:/Assorted/Small Programs/caesarcracker.py", line 16, in <module>
    char.count += 1
TypeError: unsupported operand type(s) for +=: 'builtin_function_or_method' and 'int'

 

Get a type error because it wants to call char.count a builtin function instead of operating on what it returns, which is weird so I tried temp = char.count then on another line char.count = temp+1 but that didn't work either.

[fizzlesticks]

7 minutes ago, LtStaffel said:

Traceback (most recent call last):
  File "I:/Assorted/Small Programs/caesarcracker.py", line 16, in <module>
    char.count += 1
TypeError: unsupported operand type(s) for +=: 'builtin_function_or_method' and 'int'

What type is 'char'?

[LtStaffel]

Just now, fizzlesticks said:

What type is 'char'?

my object, sorry for the confusing name

[fizzlesticks]

14 minutes ago, LtStaffel said:

Get a type error because it wants to call char.count a builtin function instead of operating on what it returns,

So char.count is a function? And you want to add 1 to what char.count() returns?

Would be a lot easier to help if you posted your code.

[LtStaffel]

2 minutes ago, fizzlesticks said:

So char.count is a function? And you want to add 1 to what char.count() returns?

Would be a lot easier to help if you posted your code.

Sure, here:

raw = raw_input("Please enter the ciphered string to crack: ")

class chars:
    def __init__(self, character):
        self.character = character
        self.count = 1

for char in raw:
    try:
        char
    except NameError:
        char = chars(char.lower())
    else:
        char.count += 1

I'm just trying to count the characters in raw.

[Azgoth 2]

17 minutes ago, LtStaffel said:

Sure, here:

raw = raw_input("Please enter the ciphered string to crack: ")

class chars:
    def __init__(self, character):
        self.character = character
        self.count = 1

for char in raw:
    try:
        char
    except NameError:
        char = chars(char.lower())
    else:
        char.count += 1

I'm just trying to count the characters in raw.

As in, you're just trying to count the number of times each character appears (i.e., for frequency analysis)?  If so, a dictionary is your best bet:

# Using list comprehension to make the dictionary
raw = raw_input("Please enter the ciphered string to crack: ")
freqs = {i:raw.count(i) for i in set(raw)}

# Or, iterating through the string
raw = raw_input("Please enter the ciphered string to crack: ")
freqs = {}
for i in raw:
  try
    freqs[i] += 1
  except KeyError:
    # character not in dictionary's keys, initialize count to 1
    freqs[i] = 1

 

[fizzlesticks]

1 minute ago, LtStaffel said:

Sure, here:

The line

char

is never going to raise an exception since you define it as the loop variable. Which means you never create an instance of your class and inside the else clause 'char' is type 'str' not 'chars' like you expect. Strings have a built-in count function so doing 'char.count += 1' is trying to add a built-in function and an int just like error says. 

[fizzlesticks]

3 minutes ago, Azgoth 2 said:

If so, a dictionary is your best bet:

A Counter would be better.

[Azgoth 2]

1 minute ago, fizzlesticks said:

A Counter would be better.

I always forget about everything other than defaultdicts in the collections module.  A counter is certainly better if the goal is frequency analysis, yes--more readable than list comprehension (but so much less fun...), and it has that nice .most_common() method.

[LtStaffel]

13 minutes ago, Azgoth 2 said:

As in, you're just trying to count the number of times each character appears (i.e., for frequency analysis)?  If so, a dictionary is your best bet:

I tried a dictionary (succesfully) but by their nature they are not ordered which is really needed for how I'm using their frequencies.

[Azgoth 2]

2 minutes ago, LtStaffel said:

I tried a dictionary (succesfully) but by their nature they are not ordered which is really needed for how I'm using their frequencies.

See @fizzlesticks reply above; try using a counter and the .most_common method (which returns items sorted by frequency).

[LtStaffel]

Just now, Azgoth 2 said:

See @fizzlesticks

Yep, I'm looking at the counter stuff he(?) linked to.

[fizzlesticks]

1 minute ago, LtStaffel said:

I tried a dictionary but by their nature they are not ordered.

OrderedDict is. You could also make an OrderedCounter with just a bit of multi inheritance. 

 

class OrderedCounter(Counter, OrderedDict):
    pass