Is there a way to get one value from a tuple in Python using expressions? def tup(): return (3, “hello”) i = 5 + tup() # I want to add just the three I know I can do this: (j, _) = tup() i = 5 + j But that would add a few dozen … Read more
I have a named tuple class in python class Town(collections.namedtuple(‘Town’, [ ‘name’, ‘population’, ‘coordinates’, ‘population’, ‘capital’, ‘state_bird’])): # … I’d like to convert Town instances into dictionaries. I don’t want it to be rigidly tied to the names or number of the fields in a Town. Is there a way to write it such that … Read more
I’ve got a Pandas DataFrame and I want to combine the ‘lat’ and ‘long’ columns to form a tuple. <class ‘pandas.core.frame.DataFrame’> Int64Index: 205482 entries, 0 to 209018 Data columns: Month 205482 non-null values Reported by 205482 non-null values Falls within 205482 non-null values Easting 205482 non-null values Northing 205482 non-null values Location 205482 non-null values … Read more
If a tuple is immutable then why can it contain mutable items? It is seemingly a contradiction that when a mutable item such as a list does get modified, the tuple it belongs to maintains being immutable. 8 Answers 8
>>> x=[1,2] >>> x[1] 2 >>> x=(1,2) >>> x[1] 2 Are they both valid? Is one preferred for some reason? 7 Answers 7
I have some object.ID-s which I try to store in the user session as tuple. When I add first one it works but tuple looks like (u’2′,) but when I try to add new one using mytuple = mytuple + new.id got error can only concatenate tuple (not “unicode”) to tuple. 7 Answers 7
This question already has answers here: Closed 9 years ago. Possible Duplicate: A Transpose/Unzip Function in Python I’ve used the zip() function from the numpy library to sort tuples and now I have a list containing all the tuples. I had since modified that list and now I would like to restore the tuples so … Read more
I have been reading the Core Python programming book, and the author shows an example like: (4, 5) < (3, 5) # Equals false So, I’m wondering, how/why does it equal false? How does python compare these two tuples? Btw, it’s not explained in the book. 4 Answers 4
Given a string that is a sequence of several values separated by a commma: mStr=”A,B,C,D,E” How do I convert the string to a list? mList = [‘A’, ‘B’, ‘C’, ‘D’, ‘E’] 7 Answers 7
Possible Duplicate: A Transpose/Unzip Function in Python I have a list that looks like this: list = ((‘1′,’a’),(‘2′,’b’),(‘3′,’c’),(‘4′,’d’)) I want to separate the list in 2 lists. list1 = (‘1′,’2′,’3′,’4’) list2 = (‘a’,’b’,’c’,’d’) I can do it for example with: list1 = [] list2 = [] for i in list: list1.append(i[0]) list2.append(i[1]) But I want … Read more
