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# BITPOS

> Find the position of the first set or clear bit (bit with a value of 1 or 0) in a Redis string key.

## Arguments

<ParamField body="key" type="str" required>
    The key to search in.
</ParamField>

<ParamField body="bit" type="0 | 1" required>
    The key to store the result of the operation in.
</ParamField>

<ParamField body="start" type="int" >
   The index to start searching at.
   </ParamField>

<ParamField body="end" type="int" >
   The index to stop searching at.
   </ParamField>

## Response

<ResponseField type="int" required>
  The index of the first occurrence of the bit in the string.
</ResponseField>

<RequestExample>
```py Example
redis.setbit("mykey", 7, 1)
redis.setbit("mykey", 8, 1)

assert redis.bitpos("mykey", 1) == 7
assert redis.bitpos("mykey", 0) == 0

# With a range
assert redis.bitpos("mykey", 1, 0, 2) == 0
assert redis.bitpos("mykey", 1, 2, 3) == -1
```

```py With Range
redis.bitpos("key", 1, 5, 20)
```

</RequestExample>