Python Study Note
2014-02-17
About Unicode
(python 3.3)
When using \xxx
to display Unicode characters, the encoding of the source file
also counts. e.g, if you type:
In a GBK based file, interpreter says:
Error:
UnicodeEncodeError: 'gbk' codec can't encode character '\xc4' in
position 2: illegal multibyte sequence
On the other hand, inside a UTF-8 file:
About Statements
Refer to: Page 320, Learning Python 5th, O'Reilly, ISBN: 978-1-449-35573-9
About ++/--
In python, there is no ++/-- operator, see Stack Overflow and
Python IAQ for more.
However ++x
makes sense, which means +(+(x))
,
so basically it's simply x
.
About Assignment Statements
Refer to: Page 340, Learning Python 5th, O'Reilly, ISBN: 978-1-449-35573-9
Argumented Assignment, Performance
If the subject is mutable and supports this operation, an augmented assignment
may run even quicker by choosing an in-place update operation instead of an
object copy.
About Divide and Mod
See the difference of 3/10
and 3//10
. /
means divide and result in decimal number, //
means "mod" and results in integer. (A new feature in python 3)
2014-02-26
The strange loop:else:
Try this code:
x = 1
while x < 3:
x = int( input('Int(try > 3 and = 1):') )
if x == 1:
break
else:
print('Wow!')
And see this two article:For/else,python的while loop中的else多余吗?
The else
will only be executed when for
loop finishes normally or while
loop is entered but not break
ed.
Python really wants to keep code simple.
There are 0 Comments.