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demo_python_ref_string_rfind_vs_rindex.py:
txt = "Hello, welcome to my world." print(txt.rfind("q")) print(txt.rindex("q"))
x
txt
=
"Hello, welcome to my world."
print
(
txt
.
rfind
(
"q"
))
print
(
txt
.
rindex
(
"q"
))
python@w3school.org.cn:/home/python#python demo_python_ref_string_rfind_vs_rindex.py
-1
Traceback (most recent call last):
File "demo_python_ref_string_rfind_vs_rindex.py", line 4 in <module>
print(txt.rindex("q"))
ValueError: substring not found