## genetics.atgc_content()


Calculate the nucleotide composition of a DNA sequence.


Usage

``` python
genetics.atgc_content(dna_sequence)
```


Counts the occurrences of each nucleotide (A, T, G, C) in the sequence. Non-standard nucleotides are ignored in the count.


## Parameters


`dna_sequence: str`  
The DNA sequence to analyze. Case-insensitive.


## Returns


`dict: Dict[str, int]`  
A dictionary with keys 'A', 'T', 'G', 'C' and their counts as values.


## Examples

``` python
    >>> atgc_content("ATGCGAT")
```

    {'A': 2, 'T': 2, 'G': 2, 'C': 1}