Setting float_series[bool_index] = None errors

[dalejung]

s = pd.Series(range(10)).astype(float)
s[s > 8] = None
s

/Users/datacaliber/Dropbox/Projects/trading/python/externals/pandas/pandas/core/internals.py in create_block(v, m, n, item, reshape)
    596                 # change the dtype
    597                 if nv is None:
--> 598                     dtype, _ = com._maybe_promote(n.dtype)
    599                     nv = v.astype(dtype)
    600                     try:

AttributeError: 'NoneType' object has no attribute 'dtype'

This is on latest master.

[dalejung]

df = pd.DataFrame({'series': pd.Series(range(10))})
df = df.astype(float)
df[df > 3] = None
df

Works for DataFrame's although it upcasts to object.

s = pd.Series(range(10)).astype(float)
s[8] = None
s

Stays as float.

[jreback]

ok....will get to this soon..thanks for the report

[jreback]

thanks for the report! keep em coming!