Python Numpy Tutorials： 集合

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集合

# -*- coding: utf-8 -*-"""Python Version: 3.5Created on Mon May  8 16:46:14 2017E-mail: [e-mail]@author: DidiLv"""# add(), len(), remove() function# Note: {**} stands for the setsanimals = {'cat', 'dog'}print('cat' in animals)   # Check if an element is in a set; prints "True"print('fish' in animals)  # prints "False"animals.add('fish')      # Add an element to a setprint('fish' in animals)  # Prints "True"print(len(animals))       # Number of elements in a set; prints "3"animals.add('cat')       # Adding an element that is already in the set does nothingprint(len(animals))       # Prints "3"animals.remove('cat')    # Remove an element from a setprint(len(animals))       # Prints "2"print("-------------------------")animals = {'cat', 'dog', 'fish'}# enumerate function using for iterationfor idx, animal in enumerate(animals):    print('#%d: %s' % (idx + 1, animal))# Prints "#1: fish", "#2: dog", "#3: cat"# 集合解析set_1 = {animal for animal in enumerate(animals)}print(set_1)