Question

我需要找到特定文本中出现的所有回文。我将从一个外部文件中提取数据。我需要注意数据的内存高效处理，因此我使用了memoryview对象。但是，我需要对memoryview对象执行一些字符串操作，因此我使用了tobytes（）方法。这是在不复制数据的情况下处理这些对象的正确方法吗？

from collections import Counter

palindrome = []
# read file as binary data
with open('some_text.txt', 'rb') as fr:

    # create memoryview object
    data = memoryview(fr.read())

    # applying the tobytes() method
    text = data.tobytes()

    # split the sentences to words
    for word in text.split():
        # append to palindrome list if true
        if is_palindome(word):
            palindrome.append(word)

    # return a Counter object with the palindromes and the number of occurences
    palindrome = Counter(palindrome)
    print(palindrome)

Answer 1

您可以只使用with open('some_text.txt', 'rb') as f: b = f.read() print(b.__class__, id(b), len(b)) data = memoryview(b) text = data.tobytes() print(text.__class__, id(text), len(text))中的<class 'bytes'> 47642448 173227 <class 'bytes'> 47815728 173227

id()

可能的输出：

data.tobytes()

对于CPython，with open('some_text.txt', 'r') as f:返回内存中对象的addres。因此，from PIL import Image from PIL import ImageDraw from PIL import ImageFont from random import seed from random import randint import numpy as np import os.path #Returns the text size in terms of width and height. def getSize(txt, font): testImg = Image.new('RGB', (1, 1)) testDraw = ImageDraw.Draw(testImg) return testDraw.textsize(txt, font) text = 'lemper' fontname = 'arial.ttf' fontsize= 25 font = ImageFont.truetype(fontname, fontsize) width, height = getSize(text, font) #Creates an image with white background of constant size. img = Image.new('RGB', (100, 100), 'white') d = ImageDraw.Draw( img) d.text(get_xy_coordinates(text, font), text, fill='black', font=font) img.save("text_images/1.png")在这种情况下返回一个副本。

考虑使用文本模式

Host

此代码段中是否正确使用了memoryview对象？

1 个答案: