How to sort the tuple string part in a list based on its float value in python?

Question

I have a list of tuples, with a Str, float

list = 
[('Trading_State_NZ <= 0.00', 0.0234),
 ('Product_Type_A <= 0.00', 0.045643),
 ('Permanent_Resident_Y <= 1.00', 0.0214),
 ('Applicant_Type_B <= 1.00', 0.0236),
 ('Valuation_Acceptable_Y <= 1.00', 0.0866),
 ('Product_Type_6 <= 0.00', 0.0172),
 ('Trading_State_NT <= 0.00', 0.0553),
 ('Trading_State_TAS <= 0.00', 0.0251),
 ('Property_Acceptable_Y <= 1.00', 0.01588),
 ('Applicant_Type1_at1_miss <= 1.00', 0.0158758),
 ('Product_Type_I <= 0.00', 0.01571),
 ('Employer_Name <= 1.00', 0.0552),
 ('Business_Name <= 0.00', 0.02557),
 ('Product_Type_E <= 0.00', 0.02457),
 ('Product_Type_CTP <= 0.00', 0.02457),
 ('Trading_Postcode <= 1.00', 0.024572),
 ('Trading_State_ts_miss <= 1.00', 0.0785),
 ('Variation_2014 <= 0.00', 0.0694),
 ('Product_Type_C <= 0.00', 0.017145),
 ('Phone_Number <= 0.00', 0.0789678)]

The string part has two sections before and after <= symbol, "Name <= value", I am looking to separate 0.00 and 1.00 values then sort in descending order based on the float value

list.sort()

list.sort() sorting based on string, I need the split the str based on value and sort?

Perplexabot · Accepted Answer · 2019-06-14 23:25:37Z

3

One way to do it:

type0 = []
type1 = []
for tup in mytups:
    if '<= 0' in tup[0]:
        type0.append(tup)
    else:
        type1.append(tup)

type0.sort(key=lambda x: x[1], reverse=True)
type1.sort(key=lambda x: x[1], reverse=True)

final_list = type0 + type1

Or using a multi level sort (shamelessly built upon @Selcuk answer):

mytups.sort(key=lambda x: (float(x[0].split("<=")[1]), -x[1]))

edited Jun 14, 2019 at 23:25

answered Jun 13, 2019 at 0:40

Perplexabot

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Selcuk · Accepted Answer · 2019-06-13 00:43:18Z

2

You can use the following:

my_list.sort(key=lambda x: -float(x[0].split("<=")[1]))

The lambda function simply splits the 0th element of a tuple using "<=" as a separator then converts the second part ([1]) of the split to a float. The .sort() method then uses this lambda function as the key.

edited Jun 13, 2019 at 0:43

answered Jun 13, 2019 at 0:37

Selcuk

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1 Comment

Selcuk Over a year ago

@DSC From the question text: [...] sorting based on string, I need the split the str based on value and sort. They are talking about the float value after <=.

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