I'm sure this has been asked and answered, but I cant find it. I have this dictionary:
{'22775': 15.9,
'22778': 29.2,
'22776': 20.25,
'22773': 9.65,
'22777': 22.9,
'22774': 12.45}
a string and a float.
I want to list the key strings in a tk listbox to allow the user to select one and then use the corresponding float in a calculation to determine a delay factor in an event.
I have this code:
def dic_entry(line):
#Create key:value pairs from string
key, sep, value = line.strip().partition(":")
return key, float(value)
with open(filename1) as f_obj:
s = dict(dic_entry(line) for line in f_obj)
print (s) #for testing only
s_ord = sorted(s.items(),key=lambda x: x[1])
print (s_ord)
The first print gets me
{'22775': 15.9,
'22778': 29.2,
'22776': 20.25,
'22773': 9.65,
'22777': 22.9,
'22774': 12.45}
as expected. The second, which I hoped would give me an ordered list of keys gets me
[('22773', 9.65),
('22774', 12.45),
('22775', 15.9),
('22776', 20.25),
('22777', 22.9),
('22778', 29.2)].
I have tried using sorteddictionary from the collections module and it gives me a sorted dictionary, but I'm having trouble extracting a list of keys.
s_ord2 = []
for keys in s.items():
s_ord2.append (keys)
print (s_ord2)
gives me a list of key value pairs:
[('22776', 20.25),
('22777', 22.9),
('22774', 12.45),
('22773', 9.65),
('22778', 29.2),
('22775', 15.9)]
I'm sure I'm doing something dumb, I just don't know what it is.
You're using items when you want to use keys:
In [1]: d = {'z': 3, 'b': 4, 'a': 9}
In [2]: sorted(d.keys())
Out[2]: ['a', 'b', 'z']
In [3]: sorted(d.items())
Out[3]: [('a', 9), ('b', 4), ('z', 3)]
d.items() gives you tuples of (key, value); d.keys() just gives you just the keys.