Question

based on this idea the following formula can be derived for approximating the integral where h

5 points Make a nested dictionary from a file The viscosity of gases depends on the temperature T. For some gases the following formula is relevant: MIT) =-.(". where the values of the constants C. To, and Mo are found in a file viscosity.dat. The temperature is measured in Kelvin. Suppose we have already loaded the file into a string viscosity data using the read method. viscosity data contains data (in order as gas, CT 0,mu_0) such as: viscosity data air, 120, 291.15, 18.27 nitrogen, 111,300.55, 17.81 oxygen, 127, 292.25, 29.18 carbon dioxide. 240, 293.15, 14.8 carbon monoxide. 118. 288.15, 17.2 hydrogen, 72.293.85,8.76 ammonia, 370,293.15,9.82 sulphur dioxide, 416,293.65, 12.54 . Convert the data in the string viscosity data into a nested dictionary mu_data such that we can look up C.76, and so for a gas with a name nane by mu data[name][X), where x can be one of 'C'. 'T_O.orm . The numerical values in mu data should all be float s. For instance, the following statements should be True: m_data[ air' ][ C ] = mu_data[ 'hydrogen' 1 'T mu_data[ sulphur dioxide 120.0 '] == 293.85 mu ' ) == 12.54 Hint I would expect a correct answer to contain a for loop. (There may be other ways of doing this but this seems most straightforward to me.) Answe.

python

python

Answer 1

01 nested dict.py - D:/Coding/Python/nested dict.py (3.7.4) File Edit Format Run Options Window Help viscosity_data = """air, 120,291.15,18.27 nitrogen, 111,300.55, 17.81 oxygen, 127, 292.25, 29.18 carbon dioxide, 240, 293.15, 14.8 carbon monoxide, 118,288.15, 17.2 hydrogen, 72,293.85, 8.76 ammonia, 370, 293.15, 9.82 sulphur dioxide, 416,293.65, 12.54""" mu_data = { } for line in viscosity data.split('\n'): #Split the line using comma data = line.split(',') #Dictionary for each gas gas = { } # Populate values gas['C'] = float (data[1]) gas ['T_1'] = float (data[2]) gas ['mu_0'] = float (data[3]) #Assign it to gas mu_data (data[0] ] = gas

OUTPUT :

================== RESTART: D: /Coding/Python/nested d ======= >>> mu_data['air']['C'] == 120 True >>> mu_data['hydrogen']['T0'] == 293.85 True >>> mu_data['sulphur dioxide']['mu_0'] == 12.54 True

CODE :

viscosity_data = """air,120,291.15,18.27
nitrogen,111,300.55,17.81
oxygen,127,292.25,29.18
carbon dioxide,240,293.15,14.8
carbon monoxide,118,288.15,17.2
hydrogen,72,293.85,8.76
ammonia,370,293.15,9.82
sulphur dioxide,416,293.65,12.54"""

mu_data = {}
for line in viscosity_data.split('\n'):
#Split the line using comma
data = line.split(',')
#Dictionary for each gas
gas = {}
#Populate values
gas['C'] = float(data[1])
gas['T_0'] = float(data[2])
gas['mu_0'] = float(data[3])
#Assign it to gas
mu_data[data[0]] = gas