Python Koans Solution —— String

Python Koans是一个学习Python编程语言的交互式教程，通过解决当中的问题来更深刻地理解Python。本系列文章为在此项目的学习中的问题解决方案及思考
Github Address: Python Koans Download Address

Lesson 2 String

字符串是 Python 中最常用的数据类型。我们可以使用引号’或”来创建字符串。

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about_strings.py

#!/usr/bin/env python# -*- coding: utf-8 -*-from runner.koan import *class AboutStrings(Koan):    def test_double_quoted_strings_are_strings(self):        string = "Hello, world."        self.assertEqual(True, isinstance(string, str))    def test_single_quoted_strings_are_also_strings(self):        string = 'Goodbye, world.'        self.assertEqual(True, isinstance(string, str))    def test_triple_quote_strings_are_also_strings(self):        string = """Howdy, world!"""        self.assertEqual(True, isinstance(string, str))    def test_triple_single_quotes_work_too(self):        string = '''Bonjour tout le monde!'''        self.assertEqual(True, isinstance(string, str))    def test_raw_strings_are_also_strings(self):        string = r"Konnichi wa, world!"        self.assertEqual(True, isinstance(string, str))    def test_use_single_quotes_to_create_string_with_double_quotes(self):        string = 'He said, "Go Away."'        self.assertEqual('He said, \"Go Away.\"', string)    def test_use_double_quotes_to_create_strings_with_single_quotes(self):        string = "Don't"        self.assertEqual("Don\'t", string)    def test_use_backslash_for_escaping_quotes_in_strings(self):        a = "He said, \"Don't\""        b = 'He said, "Don\'t"'        self.assertEqual(True, (a == b))    def test_use_backslash_at_the_end_of_a_line_to_continue_onto_the_next_line(self):        string = "It was the best of times,\n\It was the worst of times."        self.assertEqual(52, len(string))    def test_triple_quoted_strings_can_span_lines(self):        string = """Howdy,world!"""        self.assertEqual(15, len(string))    def test_triple_quoted_strings_need_less_escaping(self):        a = "Hello \"world\"."        b = """Hello "world"."""        self.assertEqual(True, (a == b))    def test_escaping_quotes_at_the_end_of_triple_quoted_string(self):        string = """Hello "world\""""        self.assertEqual("""Hello \"world\"""", string)    def test_plus_concatenates_strings(self):        string = "Hello, " + "world"        self.assertEqual("Hello, world", string)    def test_adjacent_strings_are_concatenated_automatically(self):        string = "Hello" ", " "world"        self.assertEqual("Hello, world", string)    def test_plus_will_not_modify_original_strings(self):        hi = "Hello, "        there = "world"        string = hi + there        self.assertEqual("Hello, ", hi)        self.assertEqual("world", there)    def test_plus_equals_will_append_to_end_of_string(self):        hi = "Hello, "        there = "world"        hi += there        self.assertEqual("Hello, world", hi)    def test_plus_equals_also_leaves_original_string_unmodified(self):        original = "Hello, "        hi = original        there = "world"        hi += there        self.assertEqual("Hello, ", original)    def test_most_strings_interpret_escape_characters(self):        string = "\n"        self.assertEqual('\n', string)        self.assertEqual("""\n""", string)        self.assertEqual(1, len(string))