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import sys
import re
from collections import Counter
# 使用 ：
# 清洗文本，移除标点符号并转换为小写
def clean_text ( text ) :
return re . sub ( r ' [^ \ w \ s] ' , ' ' , text ) . lower ( )
# 统计词频
def count_frequencies ( text ) :
return Counter ( word for word in clean_text ( text ) . split ( ) )
# 主函数
def main ( ) :
# 检查命令行参数数量
if len ( sys . argv ) != 3 :
print ( " Usage: python command_line_1.py <file_path> <n> " )
sys . exit ( 1 )
file_path = sys . argv [ 1 ]
n = int ( sys . argv [ 2 ] )
try :
# 打开文件并读取内容
with open ( file_path , ' r ' , encoding = ' utf-8 ' ) as file :
text = file . read ( )
# 统计词频
frequencies = count_frequencies ( text )
# 获取前n个最常见的单词
most_common = frequencies . most_common ( n )
# 输出结果
for word , freq in most_common :
print ( f " { word } : { freq } " )
except FileNotFoundError :
print ( f " File not found: { file_path } " )
except ValueError as e :
print ( f " Error: { e } " )
if __name__ == " __main__ " :
main ( )
