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It is strange to see a piece of code using 'str in str in str' syntax, e.g.:
>>> 'test' in 'testtest' in 'testtesttest'
True
>>> 'test' in 'testtest' in 'tb3'
False
>>> 'test' in 'testtesta' in 'testtesttest'
False
>>> 'test' in ('testtest' in 'testtesttest')
Traceback (most recent call last):
File "<input>", line 1, in <module>
'test' in ('testtest' in 'testtesttest')
TypeError: argument of type 'bool' is not iterable
It seems the 'in...in...' is similar to '<...<...' comparison. But a quick google did not guide me to the official answers. Any help?
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Strings are Arrays Like many other popular programming languages, strings in Python are arrays of bytes representing unicode characters. However, Python does not have a character data type, a single character is simply a string with a length of 1.
%s is used as a placeholder for string values you want to inject into a formatted string. %d is used as a placeholder for numeric or decimal values.
In Python, we use input() function to take input from the user. Whatever you enter as input, the input function converts it into a string. If you enter an integer value still input() function convert it into a string.
5.1 String Read Syntax. The read syntax for strings is an arbitrarily long sequence of characters enclosed in double quotes ( " ). Backslash is an escape character and can be used to insert the following special characters.
%s specifically is used to perform concatenation of strings together. It allows us to format a value inside a string. It is used to incorporate another string within a string. It automatically provides type conversion from value to string. The %s operator is put where the string is to be specified.
Official answer from the Python documentation:
comp_operator ::= "<" | ">" | "==" | ">=" | "<=" | "!="
| "is" ["not"] | ["not"] "in"
The in keyword is a comparison operator. And "Comparisons can be chained arbitrarily". Note that this isn't restricted to "value comparisons" (>, ==, etc.).
The code in question checks whether each is a substring of the next item in the chain.
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