Yesterday when I was young昨日當(dāng)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(nèi)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(nèi)容Yesterday when I was young昨日當(dāng)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(gè)函數(shù)，帶有4個(gè)參數(shù)#x 表示要更新的文件名稱#y 表示要被替換的內(nèi)容#z 表示 替換后的內(nèi)容#s 默認(rèn)參數(shù)為 1 表示只替換第一個(gè)匹配到的字符串# 如果參數(shù)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(gè)數(shù)字，用來(lái)記錄在讀取文件時(shí)在列表中的位置  n = 0  #默認(rèn)選項(xiàng)，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(nèi)容繼續(xù)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(jié)果Yesterday when I was young昨日當(dāng)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(jié)果Yesterday when I was young昨日當(dāng)我年少輕狂The tasting of life was sweet生命的滋味是甜的As rain upon my tonguetastingtastingtastingtasting