I am new to python and I am using Pycharm as my environment.
I am working with dictionaries now.
For some reason, Pycharm cannot recognize my : when I used it in a dictionary.
Weird thing is that it recognized it for previous keys and values..
Any help?
It is not the colon. You are missing the comma (,) which separates the elements in the dictionary.
pan = {'name':'poguaa','age':12}
will do.
Related
I am using the statement in R:
setwd("C:\\Users\\carl\\Documents\\research")
to set the working directory. It worked fine when I pasted the statement from someone else's R script but I received an error message:
Error: unexpected input in "setwd("".
when I entered the command directly or when I copied it from my script in a Word file.
It seems to be related to the fact that the double-quotes that I typed (that don't work) look a little slanted while the double-quotes in the pasted text (that work fine) look like they're straight up and down. Is there something I can do to type plain looking double-quotes instead of slanted double-quotes?
Word automatically replaces your double quotes with so-called smart quotes or curly quotes.
You need to use the regular/straight double quotes (") in r.
This support article explains how you can disable the automatic smart quote replacement in Word. In fairness though, Word is probably not the... um... ideal code editor.
I couldn't find whether Julia provides the OS specific char to separate PATH-like strings, such as PATH=c:\windows\systems32;c:\windows;... and similar environment variables in Linux. OS specific because Windows is using ";" and Linux ":". I neither could find a helper function that does the splitting already and just not exposing the separator char. But couldn't find that either.
It's easy enough to define these myself, I was only surprised not to find them.
thanks lot for your help
No, there isn't a path list separator by default. What you can do is
Sys.iswindows() ? ';' : ':'
R 4.0.0 brings in a new syntax for raw strings:
r"(raw string here can contain anything except the closing sequence)"
But this same construct in R 3.x.x produced a syntax error:
Error: unexpected string constant in "r"(asdasd)""
Does it mean that the interpreter was changed in R 4.0.0. ?
And if so - does R 4.0.0. provide a mechanism to define custom functions like foo"()" ?
No, that's not possible at the moment (nor would I anticipate it becoming possible anytime soon).
Here's the NEWS item:
There is a new syntax for specifying raw character constants similar to the one used in C++: r"(...)" with ... any character sequence not containing the sequence )". This makes it easier to write strings that contain backslashes or both single and double quotes. For more details see ?Quotes.
https://cran.r-project.org/doc/manuals/r-devel/NEWS.html
Then from ?Quotes:
Raw character constants are also available using a syntax similar to
the one used in C++: r"(...)" with ... any character
sequence, except that it must not contain the closing sequence
)". The delimiter pairs [] and {} can also be
used, and R can be used in place of r. For additional
flexibility, a number of dashes can be placed between the opening quote
and the opening delimiter, as long as the same number of dashes appear
between the closing delimiter and the closing quote.
https://github.com/wch/r-source/blob/trunk/src/library/base/man/Quotes.Rd
Here's the (git mirror of the SVN patch of the) commit where this functionality was added:
https://github.com/wch/r-source/commit/8b0e58041120ddd56cd3bb0442ebc00a3ab67ebc
Situation.. I have two tags defined, then I try to output them to the console. What comes out seems to be similar to an array, but I'd like to remove the formatting and just have the actual words outputted.
Here's what I currently have:
[Tags] ready ver10
Log To Console \n#{TEST TAGS}
And the result is
['ready', 'ver10']
So, how would I chuck the [', the ', ' and the '], thus only retaining the words ready and ver10?
Note: I was getting [u'ready', u'ver10'] - but once I got some advice to make sure I was running Python3 RobotFramework - after uninstalling robotframework via pip, and now only having robotframework installed via pip3, the u has vanished. That's great!
There are several ways to do it. For example, you could use a loop, or you could convert the list to a string before calling log to console
Using a loop.
Since the data is a list, it's easy to iterate over the list:
FOR ${tag} IN #{Test Tags}
log to console ${tag}
END
Converting to a string
You can use the evaluate keyword to convert the list to a string of values separated by a newline. Note: you have to use two backslashes in the call to evaluate since both robot and python use the backslash as an escape character. So, the first backslash escapes the second so that python will see \n and convert it to a newline.
${tags}= evaluate "\\n".join($test_tags)
log to console \n${tags}
Is there a new line constant that's platform independent in R? I'm used to C# and there's Environment.NewLine which will return \r\n on windows and \n otherwise. Searching turned up nothing, but I assume there has to be something somewhere so that scripts can be platform independent.
Related question: Is there a way to detect the platform a script is running on? This could be useful to know for other reasons (which I haven't thought of yet).
EDIT: Here's why I'm asking. I'm downloading files from an FTP server, but want to get a list of files and only download files that are on the server that don't exist locally. Here's how I'm getting the list of files:
filesonserver <- unlist(strsplit(getURL(basePath, ftp.use.epsv=F, dirlistonly=T), "\n"))
On windows, the files are separated by \r\n. On my mac (where I'm currently working), they're separated by \n. I was looking for a way to make this platform independent. I haven't tried just separating by \n on windows, which might work. There might also be a way to get the list of files as a vector without having to split them, which would avoid this entirely...
The package tryCatchLog has a function determine.platform.NewLine():
https://cran.r-project.org/package=tryCatchLog
https://github.com/aryoda/tryCatchLog/blob/master/R/platform_newline.R
If you consequently use this string instead of hard-coded "\n" your new lines will work platform-independently.
The answer to the initial question appears to be there isn't a new line constant like C# has. But it doesn't matter in my case, as the comments pointed out. It didn't occur to me until after I edited in the details that I probably didn't need to worry about it. Splitting by \n works fine on windows, even though the string containing the files names returned by getURL() is split by \r\n.