Yesterday when I was young昨日當我年少輕狂The taste of life was sweet生命的滋味是甜的As rain upon my tongue

#將文件讀取到內存中with open("./fileread.txt","r",encoding="utf-8") as f: lines = f.readlines() #寫的方式打開文件with open("./fileread.txt","w",encoding="utf-8") as f_w: for line in lines:  if "taste" in line:   #替換   line = line.replace("taste","tasting")  f_w.write(line)

#文本內容Yesterday when I was young昨日當我年少輕狂The taste of life was sweet生命的滋味是甜的As rain upon my tonguetastetastetastetaste

#定義一個函數，帶有4個參數#x 表示要更新的文件名稱#y 表示要被替換的內容#z 表示 替換后的內容#s 默認參數為 1 表示只替換第一個匹配到的字符串# 如果參數為 s = 'g' 則表示全文替換def string_switch(x,y,z,s=1): with open(x, "r", encoding="utf-8") as f:  #readlines以列表的形式將文件讀出  lines = f.readlines()  with open(x, "w", encoding="utf-8") as f_w:  #定義一個數字，用來記錄在讀取文件時在列表中的位置  n = 0  #默認選項，只替換第一次匹配到的行中的字符串  if s == 1:   for line in lines:    if y in line:     line = line.replace(y,z)     f_w.write(line)     n += 1     break    f_w.write(line)    n += 1   #將剩余的文本內容繼續輸出   for i in range(n,len(lines)):    f_w.write(lines[i])  #全局匹配替換  elif s == 'g':   for line in lines:    if y in line:     line = line.replace(y,z)    f_w.write(line)

string_switch("fileread.txt","taste","tasting") #結果Yesterday when I was young昨日當我年少輕狂The tasting of life was sweet生命的滋味是甜的As rain upon my tonguetastetastetastetaste

string_switch("fileread.txt","taste","tasting","g") #結果Yesterday when I was young昨日當我年少輕狂The tasting of life was sweet生命的滋味是甜的As rain upon my tonguetastingtastingtastingtasting