some erroe fix

basic_commands.py

@@ -1,46 +1,38 @@
->>> a = ['a', 'b', 'c', 'd', 'e']
->>> for index, item in enumerate(a): print index, item # enumerate function will generate an index for the item + item it self. 
-...
-0 a
-1 b
-2 c
-3 d
-4 e
-
-
-
+a = ['a', 'b', 'c', 'd', 'e']
+for index, item in enumerate(a): 
+    print(index, item) # enumerate function will generate an index for the item + item it self. 
 
 #convert a list to string:
 
 list1 = ['1', '2', '3']
 str1 = ''.join(list1)
 
-Or if the list is of integers, convert the elements before joining them.
+#Or if the list is of integers, convert the elements before joining them.
 
 list1 = [1, 2, 3]
 str1 = ''.join(str(e) for e in list1)
 
 
-
 #FIND method
 
-str.find(str2, beg=0 end=len(string))
+str.find(str1, beg=0, end=len(str))
 
+'''
 Parameters
 str2 -- This specifies the string to be searched.
 beg -- This is the starting index, by default its 0.
 end -- This is the ending index, by default its equal to the lenght of the string.
 
 Return Value
-This method returns index if found and -1 otherwise.
+This method returns index if found and -1 otherwise.'''
 
-str1 = "this is string example....wow!!!";
-str2 = "exam";
+str1 = "this is string example....wow!!!"
+str2 = "exam"
 
 # find function will print the position for the first character of the string if it's found!
-print str1.find(str2);
-print str1.find(str2, 10);
-print str1.find(str2, 40);
+print(str1.find(str2))
+print( str1.find(str2, 10))
+print(str1.find(str2, 40))
 
 #15
 #15
@@ -54,28 +46,32 @@
 
 # Creates a list containing 5 lists initialized to 0
 Matrix = [[0 for x in range(5)] for x in range(5)] 
-You can now add items to the list:
+
+#You can now add items to the list:
 
 Matrix[0][0] = 1
 Matrix[4][0] = 5
 
-print Matrix[0][0] # prints 1
-print Matrix[4][0] # prints 5
+print(Matrix[0][0]) # prints 1
+print(Matrix[4][0]) # prints 5
 
 
-if you have a simple two-dimensional list like this:
+#if you have a simple two-dimensional list like this:
 
 A = [[1,2,3,4],
      [5,6,7,8]]
-then you can extract a column like this:
+
+#then you can extract a column like this:
 
 def column(matrix, i):
     return [row[i] for row in matrix]
-Extracting the second column (index 1):
 
->>> column(A, 1)
+#Extracting the second column (index 1):
+
+column(A, 1)
 [2, 6]
-Or alternatively, simply:
 
->>> [row[1] for row in A]
+#Or alternatively, simply:
+
+[row[1] for row in A]
 [2, 6]