This is the part of the code that gives me a hard time:
if (id1 == id2):
idlist.append[id1]
The error:
builtins.TypeError: 'builtin_function_or_method' object is not subscriptable
the problematic line is "idlist.append[id1]"
Any idea why ? I am trying to append the value id1 hold into idlist.
Thanks !!
Lists have a method that is called append
Because it is a method you should use it like that:
.append(something)
ie. invoke (like any other func)
Related
I have created several Textarea widgets in Jupyter/Python in order to capture some string inputs.
In the highlighted in yellow that you can see below, the idea is that the user puts a list of numbers here (copied from Excel) and later I need to convert this text into a list or an array that contains these numbers (an iterable object). I have no idea how to do this. See:
When I print the type of this object that is called "plus" I get this:
print(type(plus))
<class 'ipywidgets.widgets.widget_string.Textarea'>
But, I am expecting to have something like this:
plus = [454, 555]
Can I bounce some ideas off you to get this?
Thanks a lot!!!
If you have an ipywidget in general, you can observe its change and get its value as following.
foo = widgets.Textarea()
# to get the value
foo.value
# to do something on value change
def bar(change):
print(change.new)
foo.observe(bar, names=['value'])
You will then have to format the string you get from the products value, but that shouldn't be too difficult.
Hope this helps
I try to efficiently iterate over many strings and there is a repeated part of the strings I would like to insert with a partial function
def add_seqs(seqs_outer,sequence):
return seqs_outer[0]+sequence+seqs_outer[1]
def my_function(string,start,stop,list_variable):
seqs_pre=string[:start]
seqs_post=string[stop:]
seqs_outer=(seqs_pre,seqs_post)
seqs_out=map(functools.partial(add_seqs,seqs_outer=seqs_outer),list_variable)
return seqs_out
I finally want to use an apply function over many different strings with a fixed list_variable, but I get an error in my_function:
TypeError: my_function() got multiple values for keyword argument 'seqs_outer'
I guess I do something wrong in the use of partial - how can I make the above code work?
Okay, inspired by this thread I swapped the order of arguments in
def add_seqs(seqs_outer,sequence)
to
def add_seqs(sequence,seqs_outer)
this did the job
I trying to calculate mean of one colum in a csv file.First, I read one column from .csv file and save it into a list. Next when I try to get mean it have a error
TypeError: 'builtin_function_or_method' object has no attribute '__getitem__'
my code is :
with open('XXXXXX.csv') as f:
reader = csv.DictReader(f)
for row in reader:
for (k,v) in row.items():
columns_95[k].append(v)
sVaR5 = columns_95['95%']
mean_95 = sum（sVaR5）/len(sVaR5)
and my csv looks like:
95% 99%
1.225 2.332
1.252 10.252
2.336 4.213
... ...
when I check my list, output is['1.225','1.252','2.336'] I think maybe the quote mark is the reason why my code has error. but how to fix it!Thanks!!!
sum is a function. If you want to call the function sum with the argument sVaR5, you need to write:
sum(sVaR5)
If your sVaR5 is a list of strings, you could convert them to floats for the sum:
sum(map(float, sVaR5))
If you put sum[sVaR5], Python tries to call __getitem__ on the object sum, hence the error
'builtin_function_or_method' object has no attribute '__getitem__'
I am trying to just do a basic INSERT operation to a PostgreSQL database through Python via the Psycopg2 module. I have read a great many of the questions already posted regarding this subject as well as the documentation but I seem to have done something uniquely wrong and none of the fixes seem to work for my code.
#API CALL + JSON decoding here
x = 0
for item in ulist:
idValue = list['members'][x]['name']
activeUsers.append(str(idValue))
x += 1
dbShell.executemany("""INSERT INTO slickusers (username) VALUES (%s)""", activeUsers
)
The loop creates a list of strings that looks like this when printed:
['b2ong', 'dune', 'drble', 'drars', 'feman', 'got', 'urbo']
I am just trying to have the code INSERT these strings as 1 row each into the table.
The error specified when running is:
TypeError: not all arguments converted during string formatting
I tried changing the INSERT to:
dbShell.executemany("INSERT INTO slackusers (username) VALUES (%s)", (activeUsers,) )
But that seems like it's merely treating the entire list as a single string as it yields:
psycopg2.DataError: value too long for type character varying(30)
What am I missing?
First in the code you pasted:
x = 0
for item in ulist:
idValue = list['members'][x]['name']
activeUsers.append(str(idValue))
x += 1
Is not the right way to accomplish what you are trying to do.
first list is a reserved word in python and you shouldn't use it as a variable name. I am assuming you meant ulist.
if you really need access to the index of an item in python you can use enumerate:
for x, item in enumerate(ulist):
but, the best way to do what you are trying to do is something like
for item in ulist: # or list['members'] Your example is kinda broken here
activeUsers.append(str(item['name']))
Your first try was:
['b2ong', 'dune', 'drble', 'drars', 'feman', 'got', 'urbo']
Your second attempt was:
(['b2ong', 'dune', 'drble', 'drars', 'feman', 'got', 'urbo'], )
What I think you want is:
[['b2ong'], ['dune'], ['drble'], ['drars'], ['feman'], ['got'], ['urbo']]
You could get this many ways:
dbShell.executemany("INSERT INTO slackusers (username) VALUES (%s)", [ [a] for a in activeUsers] )
or event better:
for item in ulist: # or list['members'] Your example is kinda broken here
activeUsers.append([str(item['name'])])
dbShell.executemany("""INSERT INTO slickusers (username) VALUES (%s)""", activeUsers)
I have a map that contains a list (all the values in the list are strings):
["diameter":["1", "2", "3"]]
["length":["2", "3", "4"]]
I iterate through it in freemarker:
<#list product.getSortedVariantMap.keySet() as variantCode>
<#list product.getSortedVariantMap[variantCode] as variantValue>
This works fine. However if one of the strings contains a comma like this:
def returnValue = ["diameter":["3,5"]]
I get the following error:
?size is unsupported for: freemarker.ext.beans.SimpleMethodModel
The problematic instruction:
----------
==> list product.getSortedVariantMap[variantCode] as variantValue [on line 200, column 41 in product.htm]
I have no idea what the error could be, a comma in a string shouldn't create that error.
It depends on FreeMarker configuration, but product.getSortedVariantMap most probably returns the method itself, not its return value. You should write product.sortedVariantMap. (Although I don't understand why it doesn't stop earlier, on product.getSortedVariantMap.keySet(). Maybe your example is not exactly what to run?)