Add strings (basic)

Author: hermite2053

informal/strings/concatenate_and_repeat.py

@@ -0,0 +1,4 @@
+print('侃侃' + '諤諤')
+print('侃侃' '諤諤')
+print(2 * '侃' + 2 * '諤')
+# print(2 * '侃' 2 * '諤諤') # invalid syntax

informal/strings/escape.py

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+print('I don\'t speak French.')
+print("I don\'t speak French.")
+print("I don't speak French.")
+# print('don't') # invalid syntax
+
+print('Please say "Yes".')
+print('Write "don\\\'t".')

informal/strings/index.py

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+str = 'dihydrogen monoxide'
+
+for i in range(len(str)):
+    print(str[i])
+    

informal/strings/multiple_strings_literals.py

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+print("""\
+       *
+      **
+     ***
+    ****
+   *****
+  ******
+ *******
+********
+""")

informal/strings/raw_strings.py

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+print('Hello \nWorld')
+print(r'Hello \nWorld')