python函數處理給出錯誤TypeError：不支持的操作數類型-：'NoneType'和'NoneType'

Question

我試圖讓我的代碼有點專業和基於我的代碼的功能如下：

def NOWT(nowt):#prints the number of words in the file
    nowt=wdata['sentences'].str.split().map(len).sum()
    print("Total number of the whole words: {}".format(nowt))
    return
def NOW(now): #prints the number of Tokanized words in the file
    now=data.str.split().map(len).sum()
    print("Total number of tokanized words: {}".format(now))
    return
def DIFF(diff):
    diff=NOWT(wdata)-NOW(data)
    print("The diff. is :{}".format(diff))
    return
NOW(now)
NOWT(wdata)
DIFF(data)

當我嘗試獲取其他 2 個函數的輸出總和時，出現此錯誤：

 diff=NOWT(wdata)-NOW(data)
TypeError: unsupported operand type(s) for -: 'NoneType' and 'NoneType'

任何想法我做錯了什么？

Answer 1

發生這種情況是因為所有函數都返回 None 而不是任何值。 我想您想要每個函數中第一個聲明的值。 正確的代碼是：

def NOWT(nowt):#prints the number of words in the file
    nowt=wdata['sentences'].str.split().map(len).sum()
    print("Total number of the whole words: {}".format(nowt))
    return nowt
def NOW(now): #prints the number of Tokenized words in the file
    now=data.str.split().map(len).sum()
    print("Total number of tokanized words: {}".format(now))
    return now
def DIFF(diff):
    diff=NOWT(wdata)-NOW(data)
    print("The diff. is :{}".format(diff))
    return diff
NOW(data)
NOWT(wdata)
DIFF(data)

為防止打印兩次：

def NOWT(wdata):#prints the number of words in the file
    nowt= wdata['sentences'].str.split().map(len).sum()
    print("Total number of the whole words: {}".format(nowt))
    return nowt

def NOW(data): #prints the number of Tokenized words in the file
    now= data.str.split().map(len).sum()
    print("Total number of tokenized words: {}".format(now))
    return now

def DIFF(now, nowt):
    diff=nowt-now
    print("The diff. is : {}".format(diff))
    return diff

now = NOW(data)
nowt = NOWT(wdata)
diff = DIFF(nowt, now)

另一種選擇是從回調中刪除倒數第二行和倒數第三行：

def NOWT(nowt):#prints the number of words in the file
    nowt=wdata['sentences'].str.split().map(len).sum()
    print("Total number of the whole words: {}".format(nowt))
    return nowt
def NOW(now): #prints the number of Tokenized words in the file
    now=data.str.split().map(len).sum()
    print("Total number of tokanized words: {}".format(now))
    return now
def DIFF(diff):
    diff=NOWT(wdata)-NOW(data)
    print("The diff. is :{}".format(diff))
    return diff
DIFF(data)

Answer 2

你不能減去nonetype 。 您必須將函數 return 轉換為int或float才能使其工作。

試試看

diff=int(NOWT(wdata))-int(NOW(data))