如何使用 substring 過濾掉文本文件中的行

Question

我有一個包含如下內容的文本文件：

ADUMMY ADDRESS1
BDUMMY MEMBER
AA1400 EL DORA RD
BCARLOS
A509 W CARDINAL AVE
BJASMINE

我想要一個 python 腳本來計算以“B”開頭但不包含 substring“DUMMY”的行數。

到目前為止，這是我所擁有的，但我不知道如何在“if”語句中進行過濾。

def countLinesMD(folder,f):
    file = open(folder+f,"r")
    Counter = 0

    # Reading from file
    Content = file.read()
    CoList = Content.split("\n")

    for i in CoList:
        if i.startswith("B"):
            Counter += 1
return Counter 

                                                       

Answer 1

我相信if i.startswith("B") and "DUMMY" not in i:

Answer 2

只需將其添加到if語句中：

def countLinesMD(folder,f):
    file = open(folder+f,"r")
    Counter = 0

    # Reading from file
    Content = file.read()
    CoList = Content.split("\n")

    for i in CoList:
        if i.startswith("B") and "DUMMY" not in i.split():
            Counter += 1
return Counter