Data commit

Task/Flow-control-structures/Python/flow-control-structures-1.py

@@ -0,0 +1,10 @@
+# Search for an odd factor of a using brute force:
+for i in range(n):
+    if (n%2) == 0:
+        continue
+    if (n%i) == 0:
+        result = i
+        break
+else:
+    result = None
+    print "No odd factors found"

Task/Flow-control-structures/Python/flow-control-structures-10.py

@@ -0,0 +1,13 @@
+# Let's call our custom error "StupidError"; it inherits from the Exception class
+
+class StupidError(Exception): pass
+
+# Try it out.
+try:
+    raise StupidError("Segfault") # here, we manually 'raise' the error within the try block
+except StupidError, details: # 'details' is the StupidError object we create in the try block.
+    print 'Something stupid occurred:', details # so we access the value we had stored for it...
+
+
+# Output :
+# Something stupid occurred: Segfault

Task/Flow-control-structures/Python/flow-control-structures-11.py

@@ -0,0 +1,20 @@
+    i = 101
+    for i in range(4): # loop 4 times
+        print "I will always be seen."
+        if i % 2 == 0:
+            continue # continue goes back to the loop beginning for a new iteration.
+        print "I'll only be seen every other time."
+    else:
+        print "Loop done"
+
+    # Output:
+    # I will always be seen.
+    # I will always be seen.
+    # I'll only be seen every other time.
+    # I will always be seen.
+    # I will always be seen.
+    # I'll only be seen every other time.
+    # Loop done
+
+if(__name__ == "__main__"):
+    main()

Task/Flow-control-structures/Python/flow-control-structures-12.py

@@ -0,0 +1,9 @@
+class Quitting(Exception): pass
+max = 10
+with open("some_file") as myfile:
+    exit_counter = 0
+    for line in myfile:
+        exit_counter += 1
+        if exit_counter > max:
+            raise Quitting
+        print line,

Task/Flow-control-structures/Python/flow-control-structures-2.py

@@ -0,0 +1 @@
+class MyException(Exception): pass

Task/Flow-control-structures/Python/flow-control-structures-3.py

@@ -0,0 +1,3 @@
+class MyVirtual(object):
+    def __init__(self):
+        raise NotImplementedError

Task/Flow-control-structures/Python/flow-control-structures-4.py

@@ -0,0 +1,6 @@
+try:
+    temp = 0/0
+# 'except' catches any errors that may have been raised between the code of 'try' and 'except'
+except:   # Note: catch all handler ... NOT RECOMMENDED
+    print "An error occurred."
+# Output : "An error occurred"

Task/Flow-control-structures/Python/flow-control-structures-5.py

@@ -0,0 +1,6 @@
+try:
+    temp = 0/0
+# here, 'except' catches a specific type of error raised within the try block.
+except ZeroDivisionError:
+    print "You've divided by zero!"
+# Output : "You've divided by zero!"

Task/Flow-control-structures/Python/flow-control-structures-6.py

@@ -0,0 +1,11 @@
+try:
+    temp = 0/0
+except:
+    print "An error occurred."
+# here, 'finally' executes when the try - except block ends, regardless of whether an error was raised or not
+# useful in areas such as closing opened file streams in the try block whether they were successfully opened or not
+finally:
+    print "End of 'try' block..."
+# Output :
+# An error occurred
+# End of 'try' block...

Task/Flow-control-structures/Python/flow-control-structures-7.py

@@ -0,0 +1,8 @@
+try:
+    try:
+        pass
+    except (MyException1, MyOtherException):
+        pass
+    except SomeOtherException:
+finally:
+    do_some_cleanup() # run in any case, whether any exceptions were thrown or not

Task/Flow-control-structures/Python/flow-control-structures-8.py

@@ -0,0 +1,9 @@
+try:
+    temp = 1/1 # not a division by zero error
+except ZeroDivisionError: # so... it is not caught
+    print "You've divided by zero."
+# here, 'else' executes when no exceptions are caught...
+else:
+    print "No apparent error occurred."
+# Output :
+# No apparent error occurred.

Task/Flow-control-structures/Python/flow-control-structures-9.py

@@ -0,0 +1,20 @@
+i = 0
+while 1: # infinite loop
+    try:
+       temp2 = 0/i # will raise a ZeroDivisionError first.
+       temp = math.sqrt(i)
+
+       break # 'break' will break out of the while loop
+    except ValueError: #
+        print "Imaginary Number! Breaking out of loop"
+        break # 'break' out of while loop
+    except ZeroDivisionError:
+        print "You've divided by zero. Decrementing i and continuing..."
+        i-=1 # we decrement i.
+        # we 'continue', everything within the try - except block will be executed again,
+        # this time however, ZeroDivisionError would not be raised again.
+        continue # Note that removing it, replacing it with 'pass' would perform the equivalent
+                 # see below for a better example
+# Output :
+# You've divided by zero. Decrementing i and continuing...
+# Imaginary Number! Breaking out of loop