Question: I want to delete every row that has cell with `?` value in it.
I do not know where `?` value is (i do not know name of the column).
Any idea how to do this:

```
df = pd.DataFrame({'A': [1,4,6,"?",3],
                   'B': ["?",3,5,1,4],
                   'C': [13,5,61,5, "?"]})

```

Desired output:

```
   A  B   C
0  4  3   5
1  6  5  61

```

Answer: 
you could do : 

```py
df[df == "?"] = None
df = df.dropna(axis = 0)

```
One line version : 

```
result = df.replace('?', pd.np.nan).dropna()

```