diff options
Diffstat (limited to 'python.html.markdown')
-rw-r--r-- | python.html.markdown | 32 |
1 files changed, 23 insertions, 9 deletions
diff --git a/python.html.markdown b/python.html.markdown index 753d6e8c..f8f712d3 100644 --- a/python.html.markdown +++ b/python.html.markdown @@ -63,7 +63,7 @@ allow you to write Python 3 code that will run on Python 2, so check out the Pyt # to carry out normal division with just one '/'. from __future__ import division 11/4 # => 2.75 ...normal division -11//4 # => 2 ...floored division +11//4 # => 2 ...floored division # Modulo operation 7 % 3 # => 1 @@ -123,11 +123,16 @@ not False # => True # A string can be treated like a list of characters "This is a string"[0] # => 'T' -# % can be used to format strings, like this: -"%s can be %s" % ("strings", "interpolated") +#String formatting with % +#Even though the % string operator will be deprecated on Python 3.1 and removed +#later at some time, it may still be good to know how it works. +x = 'apple' +y = 'lemon' +z = "The items in the basket are %s and %s" % (x,y) # A newer way to format strings is the format method. # This method is the preferred way +"{} is a {}".format("This", "placeholder") "{0} can be {1}".format("strings", "formatted") # You can use keywords if you don't want to count. "{name} wants to eat {food}".format(name="Bob", food="lasagna") @@ -144,8 +149,16 @@ None is None # => True # very useful when dealing with primitive values, but is # very useful when dealing with objects. -# None, 0, and empty strings/lists all evaluate to False. -# All other values are True +# Any object can be used in a Boolean context. +# The following values are considered falsey: +# - None +# - zero of any numeric type (e.g., 0, 0L, 0.0, 0j) +# - empty sequences (e.g., '', (), []) +# - empty containers (e.g., {}, set()) +# - instances of user-defined classes meeting certain conditions +# see: https://docs.python.org/2/reference/datamodel.html#object.__nonzero__ +# +# All other values are truthy (using the bool() function on them returns True). bool(0) # => False bool("") # => False @@ -234,7 +247,7 @@ li.remove(2) # Raises a ValueError as 2 is not in the list li.insert(1, 2) # li is now [1, 2, 3, 4, 5, 6] again # Get the index of the first item found -li.index(2) # => 3 +li.index(2) # => 1 li.index(7) # Raises a ValueError as 7 is not in the list # Check for existence in a list with "in" @@ -257,8 +270,9 @@ tup[:2] # => (1, 2) # You can unpack tuples (or lists) into variables a, b, c = (1, 2, 3) # a is now 1, b is now 2 and c is now 3 +d, e, f = 4, 5, 6 # you can leave out the parentheses # Tuples are created by default if you leave out the parentheses -d, e, f = 4, 5, 6 +g = 4, 5, 6 # => (4, 5, 6) # Now look how easy it is to swap two values e, d = d, e # d is now 5 and e is now 4 @@ -444,7 +458,7 @@ add(y=6, x=5) # Keyword arguments can arrive in any order. # You can define functions that take a variable number of -# positional args, which will be interpreted as a tuple if you do not use the * +# positional args, which will be interpreted as a tuple by using * def varargs(*args): return args @@ -452,7 +466,7 @@ varargs(1, 2, 3) # => (1, 2, 3) # You can define functions that take a variable number of -# keyword args, as well, which will be interpreted as a dict if you do not use ** +# keyword args, as well, which will be interpreted as a dict by using ** def keyword_args(**kwargs): return kwargs |