otp.ops.byte_at#

byte_at(value, index)#

Returns the integer byte value from the string value at the position indicated by the 0-based index. Returns -1, if the byte does not exist on this position.

Parameters:

value (str, Operation)
index (int, Operation)

Return type:

Operation

Examples

Get byte in string literal:

>>> data = otp.Tick(A=otp.ops.byte_at('hello', 1))
>>> otp.run(data)
        Time    A
0 2003-12-01  101

Get the byte for each letter in a string:

>>> data = otp.Ticks(A=[0, 1, 2, 3, 4, 5])
>>> data['X'] = otp.ops.byte_at('hello', data['A'])
>>> otp.run(data)
                     Time  A    X
0 2003-12-01 00:00:00.000  0  104
1 2003-12-01 00:00:00.001  1  101
2 2003-12-01 00:00:00.002  2  108
3 2003-12-01 00:00:00.003  3  108
4 2003-12-01 00:00:00.004  4  111
5 2003-12-01 00:00:00.005  5   -1