> For the complete documentation index, see [llms.txt](https://docs.r.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.r.xyz/glider-ide/api/argument/argument.df_reaches_from_functions_arguments.md).

# Argument.df\_reaches\_from\_functions\_arguments()

`df_reaches_from_functions_arguments() → List[Tuple[`[`Callable`](/glider-ide/api/callable.md)`, int]]`

```python
from glider import *
def query():
    func = Contracts().non_interface_contracts().functions().with_arg_count(1).exec(1)[0]
    arg = func.arguments().list()[0]
    
    results = [func]
    for (f, arg_index) in arg.df_reaches_from_functions_arguments():
        results.append(f)
        print(f.source_code() + '\n\n'+str(arg_index))
    return results
```

For the argument **account** of the function **balanceOf**:

```solidity
function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }
```

The query will return:

`[(_transfer, 1), .... ]`

```json
"root":{3 items
"contract":string"0xd705c24267ed3c55458160104994c55c6492dfcf"
"contract_name":string"Token"
"sol_function":solidity
function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }
}
"root":{3 items
"contract":string"0xd705c24267ed3c55458160104994c55c6492dfcf"
"contract_name":string"Token"
"sol_function":solidity
function _transfer(address from, address to, uint256 amount) private {
        uint256 taxAmount=0;
        if (!_isExcludedFromFee[from] && !_isExcludedFromFee[to]) {
            require(tradeOpen, "Trading not open");
            taxAmount = amount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);

            if (from == uniswapV2Pair && to != address(uniswapV2Router)) {
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the limit");
                _buyCount++;
            }

            if (to != uniswapV2Pair) {
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the limit");
            }

            if(to == uniswapV2Pair && from!= address(this) ){
                taxAmount = amount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to == uniswapV2Pair && swapEnabled && contractTokenBalance>_taxSwapThreshold) {
                swapTokensForEth(min(amount,min(contractTokenBalance,_maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        if(taxAmount>0){
          _balances[address(this)]=_balances[address(this)].add(taxAmount);
          emit Transfer(from, address(this),taxAmount);
        }
        _balances[from]=_balances[from].sub(amount);
        _balances[to]=_balances[to].add(amount.sub(taxAmount));
        emit Transfer(from, to, amount.sub(taxAmount));
    }
}
...
```

As you can see the `address to` argument flows into multiple calls to `balanceOf(to)`**,** like:

```solidity
require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the limit");
```

Returns Type: List\[Tuple\[[Callable](/glider-ide/api/callable.md), int]]