Python编程快速上手--8.9.1 扩展多重剪贴板、 8.9.2 疯狂填词、8.9.3 正则表达式查找

8.9.1 扩展多重剪贴板

扩展本章中的多重剪贴板程序，增加一个delete 命令行参数，它将从shelf 中删除一个关键字。然后添加一个delete 命令行参数，它将删除所有关键字。

#! python3
# mcb.pyw - Saves and loads pieces of text to the clipboard.
# Usage: py.exe mcb.pyw save  - Saves clipboard to keyword.
# py.exe mcb.pyw  - Loads keyword to clipboard.
# py.exe mcb.pyw list - Loads all keywords to clipboard.
# py.exe mcb.pyw delete  - delete keyword.
# py.exe mcb.pyw delete - delete list.

import shelve, pyperclip, sys
mcbShelf = shelve.open('mcb')
# save clipboard content.
if len(sys.argv) == 3 and sys.argv[1].lower() == 'save':
    mcbShelf[sys.argv[2]] = pyperclip.paste()
elif len(sys.argv) == 3 and sys.argv[1].lower() == 'delete':
    del mcbShelf[sys.argv[2]]
elif len(sys.argv) == 2:
    # List keywords and load content.
    if sys.argv[1].lower() == 'list':
        pyperclip.copy(str(list(mcbShelf.keys())))
    elif sys.argv[1] in mcbShelf:
        pyperclip.copy(mcbShelf[sys.argv[1]])
    elif sys.argv[1].lower() == 'delete':
        mcbShelf.clear() # 清空后为[] 

mcbShelf.close()

8.9.2 疯狂填词

创建一个疯狂填词（Mad Libs）程序，它将读入文本文件，并让用户在该文本文件中出现ADJECTIVE、NOUN、ADVERB 或VERB 等单词的地方，加上他们自己的文本。例如，一个文本文件（wenben.txt）可能看起来像这样：

The ADJECTIVE panda walked to the NOUN and then VERB. A nearby NOUN wasunaffected by these events.

程序将找到这些出现的单词，并提示用户取代它们。

Enter an adjective:
silly
Enter a noun:
chandelier
Enter a verb:
screamed
Enter a noun:
pickup truck

以下的文本文件将被创建：

The silly panda walked to the chandelier and then screamed. A nearby pickup truck was unaffected by these events.

import re

# read in context
wbFile = open("wenben.txt")
wbcontent = wbFile.read()
print(wbcontent)
# replace content
inputct = input("Enter an adjective:\n")
Regex = re.compile(r'ADJECTIVE?')
wbcontent = Regex.sub(inputct, wbcontent)
inputct = input("Enter a noun:\n")
Regex = re.compile(r'NOUN')
wbcontent = Regex.sub(inputct, wbcontent, 1) # 对“NOUN”仅替换一次
inputct = input("Enter a verb:\n")
Regex = re.compile(r'VERB?')
wbcontent = Regex.sub(inputct, wbcontent)
inputct = input("Enter a noun:\n")
Regex = re.compile(r'NOUN?')
wbcontent = Regex.sub(inputct, wbcontent)
print(wbcontent)
outFile = open('outfile.txt', 'w')
outFile.write(wbcontent + '\n')
outFile.close()

8.9.3 正则表达式查找

编写一个程序，打开文件夹中所有的.txt 文件，查找匹配用户提供的正则表达式的所有行。结果应该打印到屏幕上。

# 查找文件夹中所有的.txt 文件，筛选出匹配用户提供的正则表达式的所有行
import os
import re
import sys

cwd = os.getcwd()
print(cwd)
# 查找文件夹中所有的.txt 文件
match1 = re.compile(r'.*\.txt$')  # 创建匹配txt的正则
txtDirList = []  # 成功匹配
for i in os.listdir(cwd):
    if match1.search(i) is not None:  # 可以直接 if match1.search(i)
        txtDirList.append(i)
print(txtDirList)
# 根据传入的参数来匹配需要行
print(sys.argv[1])
match2 = re.compile(sys.argv[1])
for i in txtDirList:
    with open(i, 'r', encoding='utf-8') as txtFile:
        txtLineList = txtFile.readlines()
        for j in txtLineList:
            if match2.search(j):
                print(j + '\n')

https://www.cnblogs.com/wudongwei/p/9016994.html