python中实现文本大小写的转换
1、小写转换为大写
[root@PC1 test]# ls a.txt test.py [root@PC1 test]# cat a.txt U R D S F E A D E x v m e f x e r d z d v [root@PC1 test]# cat test.py ## 小写转换为大写 #!/usr/bin/python in_file = open("a.txt", "r") out_file = open("result.txt", "w") lines = in_file.readlines() for i in lines: i = i.upper() out_file.write(i) in_file.close() out_file.close() [root@PC1 test]# python test.py [root@PC1 test]# ls a.txt result.txt test.py [root@PC1 test]# cat result.txt ## 查看结果 U R D S F E A D E X V M E F X E R D Z D V
2、大写转换为小写
[root@PC1 test]# ls a.txt test.py [root@PC1 test]# cat a.txt U R D S F E A D E x v m e f x e r d z d v [root@PC1 test]# cat test.py ## 转换程序 #!/usr/bin/python in_file = open("a.txt", "r") out_file = open("result.txt", "w") lines = in_file.readlines() for i in lines: out_file.write(i.lower()) in_file.close() out_file.close() [root@PC1 test]# python test.py [root@PC1 test]# ls a.txt result.txt test.py [root@PC1 test]# cat result.txt ## 查看结果 u r d s f e a d e x v m e f x e r d z d v
3、大小写相互转换
[root@PC1 test]# ls a.txt test.py [root@PC1 test]# cat a.txt U R D S F E A D E x v m e f x e r d z d v [root@PC1 test]# cat test.py ## 程序 #!/usr/bin/python in_file = open("a.txt", "r") out_file = open("result.txt", "w") lines = in_file.readlines() for i in lines: out_file.write(i.swapcase()) in_file.close() out_file.close() [root@PC1 test]# python test.py [root@PC1 test]# ls a.txt result.txt test.py [root@PC1 test]# cat result.txt ## 转换结果 u r d s f e a d e X V M E F X E R D Z D V