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task3-字典、元组、布尔类型、读写文件.md

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PythonThinking/task3-字典、元组、布尔类型、读写文件.md
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@ -220,39 +220,34 @@ True
  让我们用这些命令做一个小小的编辑器：
```python
1 from sys import argv
2
3 script, filename = argv
4
5 print(f"We're going to erase {filename}.")
6 print("If you don't want that, hit CTRL-C (^C).")
7 print("If you do want that, hit RETURN.")
8
9 input("?")
10
11 print("Opening the file...")
12 target = open(filename, 'w')
13
14 print("Truncating the file. Goodbye!")
15 target.truncate()
16
17 print("Now I'm going to ask you for three lines.")
18
19 line1 = input("line 1: ")
20 line2 = input("line 2: ")
21 line3 = input("line 3: ")
22
23 print("I'm going to write these to the file.")
24
25 target.write(line1)
26 target.write("\n")
27 target.write(line2)
28 target.write("\n")
29 target.write(line3)
30 target.write("\n")
31
32 print("And finally, we close it.")
33 target.close()
#!/usr/bin/python
# -*- coding:utf-8 -*-
file = open('d:/b.txt',mode = 'w') # open('路径和文件名,模式= 'XX')这个格式是打开一个文件，如果没有会自动创建；路径可以修改为自己需要的路径，线上的编辑器需要改为线上的路径名
file.write('你好，\n 世界。')
file.close()
target = open('d:/b.txt',mode = 'w')
print("Truncating the file. Goodbye!")
target.truncate() # 这行命令会把之前的输入都清空
print("Now I'm going to ask you for three lines.")
line1 = input("line 1: ") # 运行后输入 Mary had a little lamb
line2 = input("line 2: ") # 运行后输入 Its fleece was white as snow
line3 = input("line 3: ") # 运行后输入 It was also tasty
print("I'm going to write these to the file.")
target.write(line1)
target.write("\n")
target.write(line2)
target.write("\n")
target.write(line3)
target.write("\n")
print("And finally, we close it.")
target.close()
```
  这真是一个很大的文件，可能是你输入过的最大的文件了。所以慢一点，写完检查一下，然后再运行。你也可以写一点运行一点，比如先运行 1-8 行，然后再多运行 5 行，然后再多几行，直到所有的都完成和运行了。
@ -260,11 +255,7 @@ True
  事实上你应该看到两样东西，首先是你新脚本的输出结果：
```text
$ python3.6 ex16.py test.txt We're going to erase test.txt.
If you don't want that, hit CTRL-C (^C). If you do want that, hit RETURN.
?
Opening the file...
Truncating the file. Goodbye!
Truncating the file. Goodbye!
Now I'm going to ask you for three lines.
line 1: Mary had a little lamb
line 2: Its fleece was white as snow