Question #$5$: frequency$($txt$)5$ pts

Returns a dictionary with the frequency count of each alphabet letter $($in lowercase$)$ in txt$.$ You

cannot make assumptions about the contents in txt$.$

Preconditions and Postconditions

txt: non$-$empty str

Returns: dict $->$ frequency count

Useful methods:

$$ The str$.$isalpha$()$ method returns True if all characters in the string are alphabetic and there

is at least one character, False otherwise.

o $\text{'}$s$\text{'}.$isalpha$()$ returns True

o $\text{'}9\text{'}.$isalpha$()$ returns False

$$ The str$.$lower$()$ method returns a copy of the string with all the cased characters converted

to lowercase.

o $\text{'}$A$\text{'}.$lower$()$ returns $\text{'}$a$\text{'}$

$$ ord$()$ returns an integer representing the Unicode code point of that character.

o ord$(\text{'}$a$\text{'})$ returns $97$

You are NOT allowed to use the count$()$ method or any other Python count libraries such as

Counter, mode, the min$()$ and max$()$ methods. You will not get credit if you used them in your

code, even if your code passed the test cases.

Example:

$>>>$ frequency$(\text{'}$mama$\text{'})$

$\{\text{'}$m$\text{'}$: $2,\text{'}$a$\text{'}$: $2\}$

$>>>$ answer $=$ frequency$(\text{'}$We ARE Penn State!!!$\text{'})$

$>>>$ answer

$\{\text{'}$w$\text{'}$: $1,\text{'}$e$\text{'}$: $4,\text{'}$a$\text{'}$: $2,\text{'}$r$\text{'}$: $1,\text{'}$p$\text{'}$: $1,\text{'}$n$\text{'}$: $2,\text{'}$s$\text{'}$: $1,\text{'}$t$\text{'}$: $2\}$