Finished Chapter 6

practice_projects/BulletPointAdder.bat

@@ -0,0 +1,2 @@
+@python.exe BulletPointAdder.py %*
+@pause

practice_projects/BulletPointAdder.py

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+#! python3
+'''
+BulletPointAdder.py - Adds Wikipadia bullet points to the start
+of each line of text on the clipboard
+'''
+
+import pyperclip
+TEXT = pyperclip.paste()
+
+# Separate lines and add stars.
+LINES = TEXT.split('\n')
+
+LINES = ["* " + line for line in LINES]
+TEXT = '\n'.join(LINES)
+
+pyperclip.copy(TEXT)

practice_projects/CharacterPictureGrid.bat

@@ -0,0 +1,2 @@
+@python.exe CharacterPictureGrid.py %*
+@pause

practice_projects/Collatz.bat

@@ -0,0 +1,2 @@
+@python.exe Collatz.py %*
+@pause

practice_projects/CommaConnection.bat

@@ -0,0 +1,2 @@
+@python.exe CommaConnection.py %*
+@pause

practice_projects/DisplayInventory.bat

@@ -0,0 +1,2 @@
+@python.exe DisplayInventory.py %*
+@pause

practice_projects/Password.bat

@@ -0,0 +1,2 @@
+@python.exe Password.py %*
+@pause

practice_projects/Password.py

@@ -0,0 +1,21 @@
+#! python3
+'''Password.py - An insecure password locker program'''
+
+import sys
+import pyperclip
+
+PASSWORDS = {'email': 'F7minlBDDuvMJuxESSKHFhTxFtjVB6',
+             'blog': 'VmALvQyKAxiVH5G8v01if1MLZF3sdt',
+             'luggage': '12345'}
+
+if len(sys.argv) < 2:
+    print('Usage: python Password.py [account] - copy account password')
+    sys.exit()
+
+ACCOUNT = sys.argv[1] # first command line arg is the account name
+
+if ACCOUNT in PASSWORDS:
+    pyperclip.copy(PASSWORDS[ACCOUNT])
+    print('Password for ' + ACCOUNT + ' copied to clipboard.')
+else:
+    print('There is no account named ' + ACCOUNT)

practice_projects/TestPrintTable.bat

@@ -0,0 +1,2 @@
+@python.exe TestPrintTable.py %*
+@pause

practice_projects/TestPrintTable.py

@@ -0,0 +1,21 @@
+#! python3
+'''TestPrintTable.py - Test print_table function'''
+
+TABLE_DATA = [['apples', 'oranges', 'cherries', 'banana'],
+              ['Alice', 'Bob', 'Carol', 'David'],
+              ['dogs', 'cats', 'moose', 'goose']]
+
+def print_table(str_list):
+    '''print the table'''
+    col_widths = [0] * len(str_list)
+    for i in range(len(str_list)):
+        for j in range(len(str_list[0])):
+            if len(str_list[i][j]) > col_widths[i]:
+                col_widths[i] = len(str_list[i][j])
+
+    for j in range(len(str_list[0])):
+        for i in range(len(str_list)):
+            print(str_list[i][j].rjust(col_widths[i]), end=' ')
+        print()
+
+print_table(TABLE_DATA)

practice_projects/characterPictureGrid.py

@@ -1,4 +1,7 @@
-grid = [['.', '.', '.', '.', '.', '.'],
+#! python3
+"""Print character picture grid"""
+
+GRID = [['.', '.', '.', '.', '.', '.'],
         ['.', 'O', 'O', '.', '.', '.'],
         ['O', 'O', 'O', 'O', '.', '.'],
         ['O', 'O', 'O', 'O', 'O', '.'],
@@ -8,7 +11,7 @@ grid = [['.', '.', '.', '.', '.', '.'],
         ['.', 'O', 'O', '.', '.', '.'],
         ['.', '.', '.', '.', '.', '.']]
 
-for i in range(len(grid[0])):
-    for l in grid:
+for i in range(len(GRID[0])):
+    for l in GRID:
         print(l[i], end="")
-    print()
+    print()

practice_projects/collatz.py

@@ -1,22 +1,28 @@
-def collatz(x):
-    if x % 2 == 0:
-        x = x // 2
-    else:
-        x = 3 * x + 1
-    print(x)
-    return x
+#! python3
+"""Calculate collatz function"""
 
-def getInput():
+def collatz(x_value):
+    '''collatz calculation'''
+    if x_value % 2 == 0:
+        x_value = x_value // 2
+    else:
+        x_value = 3 * x_value + 1
+    print(x_value)
+    return x_value
+
+def get_input():
+    '''get custom input'''
     try:
         return int(input())
     except (ValueError, NameError):
         print('Your should input an integer.')
-        return getInput()
+        return get_input()
 
-n = getInput()
-if n == 0:
+N = get_input()
+
+if N == 0:
     print('It would enter an infinite loop.')
 else:
-    while n != 1:
-        n = collatz(n)
-    
+    while N != 1:
+        N = collatz(N)
+print(N)

practice_projects/commaConnection.py

@@ -1,14 +1,18 @@
-spam = ['apple', 'bananas', 'tofu', 'cats']
+#! python3
+'''test for list_to_str'''
 
-def list2Str(l):
-    if not l:
+SPAM = ['apple', 'bananas', 'tofu', 'cats']
+
+def list_to_str(lst):
+    '''show list in string format'''
+    if not lst:
         return ''
-    if len(l) == 1:
-        return l[0]
-    s = ''
-    for i in range(len(l) - 1):
-        s += l[i] + ', '
-    s += 'and ' + l[-1]
-    return s
+    if len(lst) == 1:
+        return lst[0]
+    ret = ''
+    for i in range(len(lst) - 1):
+        ret += lst[i] + ', '
+    ret += 'and ' + lst[-1]
+    return ret
 
-print(list2Str(spam))
+print(list_to_str(SPAM))

practice_projects/displayInventory.py

@@ -1,20 +1,29 @@
-stuff = {'rope': 1, 'torch': 6, 'gold coin': 42, 'dagger': 1, 'arrow': 12}
-dragonLoot = ['gold coin', 'dagger', 'gold coin', 'gold coin', 'ruby']
+#! python3
+'''inventory'''
 
-def displayInventory(inventory):
+import os
+
+STUFF = {'rope': 1, 'torch': 6, 'gold coin': 42, 'dagger': 1, 'arrow': 12}
+DRAGON_LOOT = ['gold coin', 'dagger', 'gold coin', 'gold coin', 'ruby']
+
+def display_inventory(inventory):
+    '''display'''
     print("Inventory:")
     total_num = 0
-    for k, v in inventory.items():
-        print(str(v) + " " + k)
-        total_num += v
+    for k, value in inventory.items():
+        print(str(value) + " " + k)
+        total_num += value
     print("Total number of items: " + str(total_num))
 
-def addToInventory(inventory, addedItems):
-    for item in addedItems:
+def add_to_inventory(inventory, added_items):
+    '''add item to inventory'''
+    for item in added_items:
         if item in inventory:
             inventory[item] += 1
         else:
             inventory.setdefault(item, 0)
 
-addToInventory(stuff, dragonLoot)
-displayInventory(stuff)
+add_to_inventory(STUFF, DRAGON_LOOT)
+display_inventory(STUFF)
+
+os.system('pause')

practice_questions/README.md

@@ -5,5 +5,4 @@
 - [Chapter 3 - Functions](ch03/README.md)
 - [Chapter 4 - Lists](ch04/README.md)
 - [Chapter 5 – Dictionaries and Structuring Data](ch05/README.md)
-
-
+- [Chapter 6 – Manipulating Strings](ch06/README.md)

practice_questions/ch05/README.md

@@ -1,21 +1,27 @@
 # Chapter 5 – Dictionaries and Structuring Data
 
 > Q: 1. What does the code for an empty dictionary look like?
+
 `{}`
 
 > Q: 2. What does a dictionary value with a key 'foo' and a value 42 look like?
+
 `{'foo', 42}`
 
 > Q: 3. What is the main difference between a dictionary and a list?
+
 The item stored in dictionary are unordered, while the items in a list are ordered.
 
 > Q: 4. What happens if you try to access spam['foo'] if spam is {'bar': 100}?
+
 `KeyError` error.
 
 > Q: 5. If a dictionary is stored in spam, what is the difference between the expressions 'cat' in spam and 'cat' in spam.keys()?
+
 no different.
 
 > Q: 6. If a dictionary is stored in spam, what is the difference between the expressions 'cat' in spam and 'cat' in spam.values()?
+
 `'cat' in spam` checks whether there is a 'cat' key, while `'cat' in spam.values()` checks whether there is a 'cat' value.
 
 > Q: 7. What is a shortcut for the following code?

practice_questions/ch06/README.md

@@ -0,0 +1,50 @@
+# Chapter 6 – Manipulating Strings
+
+> Q: 1. What are escape characters?
+
+Escape characters represent characters in string values that would otherwise be difficult or impossible to type into code.
+
+> Q: 2. What do the \n and \t escape characters represent?
+
+newline, tab
+
+> Q: 3. How can you put a \ backslash character in a string?
+
+`\\`
+
+> Q: 4. The string value "Howl's Moving Castle" is a valid string. Why isn’t it a problem that the single quote character in the word Howl's isn’t escaped?
+
+because of double quotes.
+
+> Q: 5. If you don’t want to put \n in your string, how can you write a string with newlines in it?
+
+Multiline strings.
+
+> Q: 6. What do the following expressions evaluate to?
+> `'Hello world!'[1]`
+> `'Hello world!'[0:5]`
+> `'Hello world!'[:5]`
+> `'Hello world!'[3:]`
+
+'e', 'Hello', 'Hello', 'lo world!'
+
+> Q: 7. What do the following expressions evaluate to?
+> 'Hello'.upper()
+> 'Hello'.upper().isupper()
+> 'Hello'.upper().lower()
+
+'HELLO', True, 'hello'
+
+> Q: 8. What do the following expressions evaluate to?
+> 'Remember, remember, the fifth of November.'.split()
+> '-'.join('There can be only one.'.split())
+
+['Remember,', 'remember,', 'the', 'fifth', 'of', 'November.']
+
+> Q: 9. What string methods can you use to right-justify, left-justify, and center a string?
+
+`rjust`, `ljust`, `center`
+
+> Q: 10. How can you trim whitespace characters from the beginning or end of a string?
+
+`lstrip`, `rstrip`