Mastering Python Regular Expressions by Víctor Romero, Félix López

By Víctor Romero, Félix López

A brief and immediately to the purpose advisor that explains the implementation of standard Expressions in Python.This booklet is geared toward Python builders who are looking to easy methods to leverage standard Expressions in Python. simple wisdom of Python is needed for a greater realizing.

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X, which calls the appropriate method portably. 6+) # Till StopIteration See “The iteration protocol” for more on the mechanism used by generator expressions, and “The yield Statement” for the related generator function, which also creates a generator object. 52 | Python Pocket Reference Other comprehension expressions See also dictionary and set comprehensions elsewhere in this book (sections “Dictionaries” and “Sets”). 7 {0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81} Dictionaries Dictionaries are mutable (changeable) mappings of object refer‐ ences accessed by key (not position).

L = [x ** 2 for x in range(9)] Creates a list by collecting expression results during itera‐ tion (list comprehension). append(X) Inserts the single object X at the end of L, changing the list in-place. extend(I) Inserts each item in any iterable I at the end of L in-place (like an in-place +). Similar to L[len(L):] = I. Hint: use L[:0] = I to prepend all items in I. sort(key=None, reverse=False) Sorts L in-place, in ascending order by default. If passed, key specifies a function of one argument that is used to extract or compute a comparison value from each list element.

L = [x ** 2 for x in range(9)] Creates a list by collecting expression results during itera‐ tion (list comprehension). append(X) Inserts the single object X at the end of L, changing the list in-place. extend(I) Inserts each item in any iterable I at the end of L in-place (like an in-place +). Similar to L[len(L):] = I. Hint: use L[:0] = I to prepend all items in I. sort(key=None, reverse=False) Sorts L in-place, in ascending order by default. If passed, key specifies a function of one argument that is used to extract or compute a comparison value from each list element.

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