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Re: Test to see if variable exists >>>>> "lamar" == lamar air <lamar_air@hotm ail.com> writes: lamar> I need an if statement to test if a variable exists in a lamar> pyton script eg. if var1 exists: do this else: do this --try: x except NameError: # x doesn't exist, do something else: # x exists, do something else
Well, actually it's going to make your code a little slower, It's going to take 1 more second to run for each 10 million times (aprox) you declare a variable. Here, check this out: [CODE=vb] Option Explicit Dim n As Integer Sub One () Dim i As Integer For i = 1 To 10: i = i: Next End Sub Sub Two () For n = 1 To 10: n = n: Next End Sub Sub Test ...
Re: Fastest way to check variable against two values "Paul Hsieh" <websnarf@gmail .comwrote in message news:c48ff287-ffcf-46e6-9505-88f392415f39@b9 g2000prh.google groups.com...
A Dictionary Comprehension takes any input and outputs a dictionary, as long as you assign a key and a value in the “do something” area at the beginning. {v:k for (k, v) in my_dict.items ()} ^^ Associate key and value here. Unlike the list of dictionaries above, we want to have a dictionary as output.
Hello, How to determine if a Session Variable exists? In Page_Load I need to check is Session("MyVar") Exists. If it doesn't exist then I created it and give it a value: Session("myVar") = "Value" Thanks, Miguel
In Python, or any interpreted byte-code executed language, reducing the number of byte-codes is usually more important than the performance of the byte-code itself. If the vector [1,2] is created at interpretation time (I don't know if it is or it isn't), then certainly this is probably the fastest approach in python.
Dear Pythonists; Curious if there exists in Python package(s) for use as lexer/parser for implementation of language grammars? Already using cmd.py from the standard distro for it's basic features but wishing for much more advanced capability. As such, I refer to flex/bison because though complex they are general purpose and
So you have to : - find which instruction of your operating system resizes windows (mine ins Linux, so it is "wmctrl -r <window title> -e 0,0,0,<width>,< height>". - use the os.system () function to pass this instruction from python to the OS. - use the multi-threading capabilities of Python, so that once the window exist, which means that the ...
Hello, I am using a for loop to iterate through an array and need to assign each iteration to a new variable, such as arr = ['bread', 'milk', 'cheese'] for i in arr: print i but instead of printing i, I want the for lopp to assign each iteration to a unique variable, so that when the for loop completes var1
Code: def checkCRC(message): #CRC-16-CITT poly, the CRC sheme used by ymodem protocol. poly = 0x1021. #16bit operation register, initialized to zeros. reg = 0x0000. #pad the end of the message with the size of the poly. message += '\x00\x00'. #for each bit in the message.