Readline() 在输出中给我空白 space

Question

我是 Python 的初学者，我正在尝试创建一个没有库的具有添加和搜索功能的数据库。一切都很好，除了当编译器看到这个词在文本文件中并且我告诉它 readline() 时，它给了我一个空白 space。这是我的代码：

data = open("C:\Users\PC\Desktop\Python Course\Course\Advanced Python\Exam\data.txt", "a+")  

x = input ("Would you like to add or search?")
if x == "Add".lower():

data.write(input("Please enter: (Name,Age,Address,Date of birth,blood type,type(doctor,nurse,patient),disease,Married(yes or no)"))
      data.write('\n')
   
def search():
    if x == "Search".lower():
      y = input ("What would you like to search for? (Name,age,type)")

    if y == "Name".lower():
      z = input("Who would you like to search for?")
        
      with open("C:\Users\PC\Desktop\Python Course\Course\Advanced Python\Exam\data.txt", "r") as f:
        if z in f.read():
          print(f.readline())

search()

如果有人能告诉我如何修复它，我将不胜感激。提前致谢！

Answer 1

你可以这样做：

with open("C:\Users\PC\Desktop\Python Course\Course\Advanced Python\Exam\data.txt", "r") as f:
    for line in f:
        if z in line:
            print(line)

请注意它会打印出所有匹配的行。如果您只想打印第一次出现，您可以在找到匹配项时中断 for 循环：

with open("C:\Users\PC\Desktop\Python Course\Course\Advanced Python\Exam\data.txt", "r") as f:
    for line in f:
        if z in line:
            print(line)
            break

Readline() 在输出中给我空白 space

Readline() is giving me blank space in output

python

database

search

readline