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# rougier / numpy-100 Public

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# 100 numpy exercises

This is a collection of exercises that have been collected in the numpy mailing list, on stack overflow and in the numpy documentation. The goal of this collection is to offer a quick reference for both old and new users but also to provide a set of exercises for those who teach.

If you find an error or think you've a better way to solve some of them, feel free to open an issue at https://github.com/rougier/numpy-100. File automatically generated. See the documentation to update questions/answers/hints programmatically.

#### 17. What is the result of the following expression? (★☆☆)

```0 * np.nan
np.nan == np.nan
np.inf > np.nan
np.nan - np.nan
np.nan in set([np.nan])
0.3 == 3 * 0.1```

#### 26. What is the output of the following script? (★☆☆)

```# Author: Jake VanderPlas

print(sum(range(5),-1))
from numpy import *
print(sum(range(5),-1))```

```Z**Z
2 << Z >> 2
Z <- Z
1j*Z
Z/1/1
Z<Z>Z```

#### 28. What are the result of the following expressions? (★☆☆)

```np.array(0) / np.array(0)
np.array(0) // np.array(0)
np.array([np.nan]).astype(int).astype(float)```

#### 32. Is the following expressions true? (★☆☆)

`np.sqrt(-1) == np.emath.sqrt(-1)`

#### 54. How to read the following file? (★★☆)

``````1, 2, 3, 4, 5
6,  ,  , 7, 8
,  , 9,10,11
``````