How python uses the index () function

Editor to share with you how python uses the index () function, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Index () detects whether the string contains the specified character and returns the starting index value. If it does not contain an error str.index ("Hello") # return value: 0str.index ("o") # return value: 4str.index ("W") # return value: 6str.index ("R") # return value: error message, because R is not included in it. Therefore, it is recommended to use with caution, if the value does not exist, the program error will be finished. What are the data types of python? the data type of python: 1. Numeric types, including int (integer), long (long integer), and float (floating point). two。 String, which is of type str and type unicode, respectively. 3. Boolean, Python Boolean is also used for logical operations and has two values: True (true) and False (false). 4. List, the list is the most frequently used data type in Python, and any data type can be placed in the collection. 5. Tuples are identified by "()", and internal elements are separated by commas. 6. A dictionary is a collection of key-value pairs. 7. A collection is an unordered, non-repeating combination of data.

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