x
txt = "Hello, welcome to my world."print(txt.find("q"))print(txt.index("q"))
-1
Traceback (most recent call last):
File "demo_ref_string_find_vs_index.py", line 4 in <module>
print(txt.index("q"))
ValueError: substring not found
Traceback (most recent call last):
File "demo_ref_string_find_vs_index.py", line 4 in <module>
print(txt.index("q"))
ValueError: substring not found