Question

For the given string str = "Hello PYTHON" write the positive & negative index and also write the OP for the following statement

str 71 =

str [1] str [- 3]​

Answer 1

str = 'Hello PYTHON'

Positive indexing:

$\begin{array}{|c|c|}\cline{1-2}\tt Character & \tt Index\ Value\\\cline{1-2}\sf H & -0\\\cline{1-2} \sf e & 1\\\cline{1-2}\sf l & 2\\\cline{1-2}\sf l & 3\\\cline{1-2}\sf o & 4\\\cline{1-2} & 5\\\cline{1-2}\sf P & 6\\\cline{1-2}\sf Y & 7\\\cline{1-2}\sf T & 8\\\cline{1-2}\sf H & 9\\\cline{1-2}\sf O & 10\\\cline{1-2}\sf N & 11\\\cline{1-2}\end{array}$

Negative indexing:

$\begin{array}{|c|c|}\cline{1-2}\tt Character & \tt Index\ Value\\\cline{1-2}\sf H & -12\\\cline{1-2} \sf e & -11\\\cline{1-2}\sf l & -10\\\cline{1-2}\sf l & -9\\\cline{1-2}\sf o & -8\\\cline{1-2} & -7\\\cline{1-2}\sf P & -6\\\cline{1-2}\sf Y & -5\\\cline{1-2}\sf T & -4\\\cline{1-2}\sf H & -3\\\cline{1-2}\sf O & -2\\\cline{1-2}\sf N & -1\\\cline{1-2}\end{array}$

Output for str[1]:

• 'e'

Output for str[-3]:

• 'H'

String slicing refers to the act of retrieving a substring from a given string. It is done using index values. Positive indexing indicates that the string is being traversed from left to right, while negative indexing traverses from right to left.