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Python Language Methodcaller


Instead of this lambda-function that calls the method explicitly:

alist = ['wolf', 'sheep', 'duck']
list(filter(lambda x: x.startswith('d'), alist))     # Keep only elements that start with 'd'
# Output: ['duck']

one could use a operator-function that does the same:

from operator import methodcaller
list(filter(methodcaller('startswith', 'd'), alist)) # Does the same but is faster.
# Output: ['duck']