Let's re-define our function with keyword arguments:
def RC_voltage(t, v0=100, R=1000, C=1e-9):
"""
Calculate the voltage at time t for an R-C circuit
with initial voltage v0.
"""
tau = R * C
return v0 * exp(-t / tau)
res = 250e3 # Ohms
cap = 4e-6 # Farads
v0 = 100.0 # Volts
t = 1.0 # seconds
v = RC_voltage(t, v0=v0, R=res, C=cap)
print('Voltage at t=' + str(n(t, digits=4)) + 's is ' +
str(n(v, digits=4)) + 'V')The output is the same as the previous example.
Declaring keyword arguments is very similar to declaring positional arguments. If there are keyword arguments, they must be defined after the positional arguments. The default value of each keyword argument must be given. The following is the general form of a function definition with positional and keyword arguments:
def function_name(argument_1, argument_2, … , argument_n, keyword_arg_1=default_value,…...