Method signature:
index(elem[, start[, stop]])
Parameters:
elem - The element to be found in the deque.
start - Position in deque at which the search should start.
stop - Position in deque at which the search should stop.
Overview:
- The index() method searches for an element as defined by the parameter elem and returns the index at which the element is found in the python deque.
- If the specified element is not in the deque Python raises an exception of type ValueError.
- If the parameters start and stop are provided then searching for the element is restricted between the positions/indexes start and stop.
Example1:
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import collections
# create two complex number objects complexNum1 = complex(20,-1) complexNum2 = complex(21,-1)
# Add complex numbers to the deque d1 = collections.deque() d1.append(complexNum1) d1.append(complexNum2)
# Create another complex number which will be used for searching searchNumber = complex(21,-1)
# Search the deque for the given complex number pos = d1.index(searchNumber)
# Print results print("Complex number %s was found in the deque at index:%d"%(searchNumber, pos))
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Output:
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Complex number (21-1j) was found in the deque at index:1 |
Example2:
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import collections
words = collections.deque(("Jack", "and", "Jill", "went", "up", "the", "hill", "To", "fetch", "a", "pail", "of", "water")) startIndex = 2 stopIndex = 7 what2Find = "hill" pos = words.index(what2Find, startIndex, stopIndex) print("The word '%s' is found at index:%d"%(what2Find, pos)) |
Output:
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The word 'hill' is found at index:6 |