lou:~/ $ python3 [12:54:30] Python 3.5.2 (default, Jul 17 2016, 00:00:00) [GCC 4.8.4] on linux Type "help", "copyright", "credits" or "license" for more information. >>> s = "faulty for a reason" >>> s.find("for") 7 >>> s.find("fora") -1 >>> s.startwith("fa") Traceback (most recent call last): File "", line 1, in AttributeError: 'str' object has no attribute 'startwith' >>> s.startswith("fa") True >>> s,endswith("reason") Traceback (most recent call last): File "", line 1, in NameError: name 'endswith' is not defined >>> s.endswith("reason") True >>> s = abcba Traceback (most recent call last): File "", line 1, in NameError: name 'abcba' is not defined >>> s = "abcba" >>> s 'abcba' >>> z = [::-1] File "", line 1 z = [::-1] ^ SyntaxError: invalid syntax >>> z = s[::-1] >>> z 'abcba' >>> s = abcde Traceback (most recent call last): File "", line 1, in NameError: name 'abcde' is not defined >>> s = "abcde" >>> z = s[::-1] >>> z 'edcba' >>> s = input("Please enter a string: ") Please enter a string: e >>> vim palindrome.py File "", line 1 vim palindrome.py ^ SyntaxError: invalid syntax >>> exit() shiyanlou:~/ $ vim palindrome.py [13:03:36] shiyanlou:~/ $ chmod +x *.py [13:07:15] shiyanlou:~/ $ ll [13:07:30] \u603b\u7528\u91cf 12K drwxrwxr-x 2 shiyanlou shiyanlou 4.0K 8\u6708 17 2016 Code drwxrwxr-x 2 shiyanlou shiyanlou 4.0K 8\u6708 17 2016 Desktop -rwxrwxr-x 1 shiyanlou shiyanlou 178 2\u6708 12 13:07 palindrome.py shiyanlou:~/ $ ./palindrome.py [13:07:35] Please enter a string: abcba The string is a palindrome shiyanlou:~/ $ python3 [13:08:10] Python 3.5.2 (default, Jul 17 2016, 00:00:00) [GCC 4.8.4] on linux Type "help", "copyright", "credits" or "license" for more information. >>> s = "i am a great programmer" >>> s.len() Traceback (most recent call last): File "", line 1, in AttributeError: 'str' object has no attribute 'len' >>> len(s) 23 >>> len(s.split()) 5 >>> z = len(s.split()) >>> z 5 >>> exit() shiyanlou:~/ $ vim countwords.py [13:20:43] shiyanlou:~/ $ chmod +x countwords.py [13:23:48] shiyanlou:~/ $ ll [13:24:16] \u603b\u7528\u91cf 16K drwxrwxr-x 2 shiyanlou shiyanlou 4.0K 8\u6708 17 2016 Code -rwxrwxr-x 1 shiyanlou shiyanlou 139 2\u6708 12 13:23 countwords.py drwxrwxr-x 2 shiyanlou shiyanlou 4.0K 8\u6708 17 2016 Desktop -rwxrwxr-x 1 shiyanlou shiyanlou 178 2\u6708 12 13:07 palindrome.py shiyanlou:~/ $ ./countwords.py [13:24:18] Please enter a line:i learn python3 with shiyanlou^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[ The number of words in the line are 0 shiyanlou:~/ $ ./countwords.py [13:25:58] Please enter a line:shiyanou is good The number of words in the line are 3 shiyanlou:~/ $ I an a great programmer [13:26:36] zsh: command not found: I shiyanlou:~/ $ ./countwords.py [13:27:05] Please enter a line:I am a great programmer The number of words in the line are 5 shiyanlou:~/ $

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