cs50 可读性 pset6 python - 索引计算问题

Question

我的 pset6 可读性中的索引计算问题

这是我的代码，我认为它是正确的，但是，每段的评分都是错误的，因为索引计算是错误的。虽然，字母、单词和句子计数是正确的。那么，问题出在哪里呢？有人帮帮我吗？

from cs50 import get_string
import math

# Loop to count the letters
letters = 0
words = 0
sentences = 0

# Prompt user for some text.
text = get_string("Text: ")

# Loop to count the letters(s) of a paragraph
def count_letters():
    global letters
    for i in range(len(text)):
        if text[i].lower() or text[i].upper():
            letters += 1
            # pass
    print(letters)
    return letters
count_letters()

# Loop to count the words of the paragraph.

def count_words():
    global words
    for i in range(len(text)):
        if text[i].isspace():
            words += 1
        # TODO
        if text[i].isspace() and text[i + 1].isspace():
            words -= 1
    print(words + 1)
    return words + 1
count_words()

# Loop to count sentences of the paragraph.

def count_sentences():
    global sentences
    for i in range(len(text)):
        if text[i] == "." or text[i] == "!" or text[i] == "?":
            sentences += 1
    print(sentences)
    return sentences
count_sentences()

# Calc the index of the grades

def indexOfGrade():
    global letters
    global words
    global sentences
    l = letters / words * 100
    s = sentences / words * 100
    index = round(0.0588 * l - 0.296 * s - 15.8)
    print(letters / words)
    print(l)
    print(s)
    print(index)

    # grades

    if index >= 16:
        print("Grade 16+")
    elif index < 1:
        print("Before Grade 1")
    else:
        print(f"Grade {index}")

indexOfGrade()

Answer 1

Yahooo，经过很多时间我弄清楚了你的错误。

def count_words():
    global words
    for i in range(len(text)):
        if text[i].isspace():
            words += 1
        # TODO
        if text[i].isspace() and text[i + 1].isspace():
            words -= 1
    print(words + 1)
    return words + 1 #This part is wrong

最后一行return只是return的值，不会改变变量words的值，所以需要更正如下

def count_words():
    global words
    for i in range(len(text)):
        if text[i].isspace():
            words += 1
        # TODO
        if text[i].isspace() and text[i + 1].isspace():
            words -= 1
    print(words + 1)
    words += 1
    return words

此外，字母、单词和句子变量可以选择为 float 而不是 int，并且在计算索引时，python 将省略剩余的小数部分，因此舍入可能无效。

另外，我在我的设备上执行了 check50，所有结果都是绿色的（正确）

此外，if text[i].isspace() and text[i + 1].isspace(): 是错误的，您需要完全删除该部分。

因此这里是经过必要更改的最终答案。

from cs50 import get_string
import math

# Loop to count the letters
letters = float(0)
words = float(0)
sentences = float(0)

# Prompt user for some text.
text = get_string("Text: ")

# Loop to count the letters(s) of a paragraph
def count_letters():
    global letters
    for i in range(len(text)):
        if (text[i] >= 'a' and text[i] <= 'z') or (text[i] >= 'A' and text[i] <= 'Z'):
            letters += 1
            # pass
    # # print(letters)
    return letters
count_letters()

# Loop to count the words of the paragraph.

def count_words():
    global words
    for i in range(len(text)):
        if text[i].isspace():
            words += 1
        # # TODO
        # if text[i].isspace() and text[i + 1].isspace():
        #     pass
    # # print(words + 1)
    words += 1
    return words + 1
count_words()

# Loop to count sentences of the paragraph.

def count_sentences():
    global sentences
    for i in range(len(text)):
        if text[i] == "." or text[i] == "!" or text[i] == "?":
            sentences += 1
    # # print(sentences)
    return sentences
count_sentences()

# Calc the index of the grades

def indexOfGrade():
    global letters
    global words
    global sentences
    # print(letters)
    # print(words)
    # print(sentences)
    l = 100 * letters / words
    # print(l)
    s = sentences / words * 100
    # print(s)
    index = round(0.0588 * l - 0.296 * s - 15.8)
    # # print(letters / words)
    # print(0.0588 * l - 0.296 * s - 15.8)
    # print(l)
    # print(s)
    # print(index)

    # grades

    if index >= 16:
        print("Grade 16+")
    elif index < 1:
        print("Before Grade 1")
    else:
        print(f"Grade {index}")

indexOfGrade()

注意：您可以选择删除所有评论语句。

Link to my check50 result

cs50 可读性 pset6 python - 索引计算问题

cs50 readability pset6 python - Index calculation Issue

python

readability

cs50

我的 pset6 可读性中的索引计算问题