文件和异常练习——python编程从入门到实践

10-1 Python学习笔记:在文本编辑器中新建一个文件,写几句话来总结一下你至此学习到的python知识,其中每一行都以“In Python you can”打头。将这和文件命名为learning_python.txt,并将其存储到为完成本章节练习而编写的程序所在的目录。编写一个程序,它读取这个文件,并将所写内容打印三遍:第一次打印时读取整个文件;第二次打印时遍历文件对象;第三次打印时将各行内容存储到一个列表中,再在with代码块外打印它们。

with open('learning_python.txt') as file_object:
    contents = file_object.read()
    print(contents.rstrip())

with open('learning_python.txt') as file_object:
    for line in file_object:
        print(line.rstrip())

with open('learning_python.txt') as file_object:
    lines = file_object.readlines()

string = ''
for line in lines:
    string = string + line.strip()

print(string)

10-2 C语言学习笔记:可使用方法replace()将字符串中的特定单词都替换为另一个单词。下面是一个简单的示例,演示了如何将句子中的“dog”替换为“cat”:

message = "I really like doges."
print(message.replace('dog', 'cat'))

  读取刚创建的文件learning_python.txt中的每一行,将其中Python都替换为另一门语言,如C。将修改后的各行都打印到屏幕上。

with open('learning_python.txt') as file_object:
    for line in file_object:
        line = line.replace('Python', 'C')
        print(line.rstrip())

10-3 访客:编写一个程序,提示用户输入其名字;用户做出响应后,将其名字写入到文件guest.txt中。

filename = 'guest.txt'
with open(filename, 'w') as file_object:
    name = input('Please enter your name: ')
    file_object.write(name)

10-4 访客名单:编写一个while循环,提示用户输入其名字。用户输入其名字后,在屏幕上打印一句问候语,并将一条访问记录添加到文件guest.txt中。确保这个文件中的每条记录都独占一行。

filename = 'guest.txt'
with open(filename, 'w') as file_object:
    while True:
        name = input("Please enter your name and enter 'q' to quit: ")
        if name == 'q':
            break
        else:
            great_user = "Hello " + name + ".\n"
            print(great_user)
            file_object.write(great_user)

10-5 关于编程的用户调查:编写一个while循环,询问用户为何喜欢编写。每当用户输入一个原因后,都将添加到一个存储所有原因的文件中。

filename = 'The reason of like programming.txt'
with open(filename, 'w') as file_object:
    file_object.write("The reason of our like programming:\n")
with open(filename, 'a') as file_object:
    while True:
        reason = input("Enter the reason of you like programming and if enter 'q' to quit: ")
        if reason == 'q':
            break
        else:
            file_object.write(reason + '\n')

 

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