Count NaN in a list

# Create a list with NaN
x = [1, np.nan, np.nan, 2, np.nan]

print(x)
print(type(x))

[1, nan, nan, 2, nan]
<class 'list'>

# Import library
import numpy as np

# Count NaN
y = x.count(np.nan)

# Output:
print("Count of NaN:", y)

Count of NaN: 3

# Import library
import numpy as np

# Count NaN
y = np.isnan(x).sum()

# Output:
print("Count of NaN:", y)

Count of NaN: 3

# Import library
import numpy as np

# Count NaN
y = np.count_nonzero(np.isnan(x))

# Output:
print("Count of NaN:", y)

Count of NaN: 3