﻿ Python Math: Get the length and angle of a complex number - w3resource # Python Math: Get the length and angle of a complex number

## Python Math: Exercise-34 with Solution

Write a Python program to get the length and the angle of a complex number.

Sample Solution:-

Python Code:

``````import cmath
cn = complex(3,4)
#length of a complex number.
print("Length of a complex number: ", abs(cn))
# gets angle. return in radians, between  [-π, π]
print("Complex number Angle: ",cmath.phase(0+1j) )
```
```

Sample Output:

```Length of a complex number:  5.0
Complex number Angle:  1.5707963267948966
```

Flowchart: Python Code Editor:

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## Python: Tips of the Day

Python: Get the Key Whose Value Is Maximal in a Dictionary

```>>> model_scores = {'model_a': 100, 'model_z': 198, 'model_t': 150}
>>> # workaround
>>> keys, values = list(model_scores.keys()), list(model_scores.values())
>>> keys[values.index(max(values))]
'model_z'
>>> # one-line
>>> max(model_scores, key=model_scores.get)
'model_z'
```