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Try to fix BUG #2599 #2635

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Try to fix BUG #2599 #2635

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39 changes: 25 additions & 14 deletions pandas/src/parser.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -1649,20 +1649,31 @@ def _concatenate_chunks(list chunks):
#----------------------------------------------------------------------

# NA values

na_values = {
np.float64 : np.nan,
np.int64 : INT64_MIN,
np.int32 : INT32_MIN,
np.int16 : INT16_MIN,
np.int8 : INT8_MIN,
np.uint64 : UINT64_MAX,
np.uint32 : UINT32_MAX,
np.uint16 : UINT16_MAX,
np.uint8 : UINT8_MAX,
np.bool_ : UINT8_MAX,
np.object_ : np.nan # oof
}
def _compute_na_values():
int64info = np.iinfo(np.int64)
int32info = np.iinfo(np.int32)
int16info = np.iinfo(np.int16)
int8info = np.iinfo(np.int8)
uint64info = np.iinfo(np.uint64)
uint32info = np.iinfo(np.uint32)
uint16info = np.iinfo(np.uint16)
uint8info = np.iinfo(np.uint8)
na_values = {
np.float64 : np.nan,
np.int64 : int64info.min,
np.int32 : int32info.min,
np.int16 : int16info.min,
np.int8 : int8info.min,
np.uint64 : uint64info.max,
np.uint32 : uint32info.max,
np.uint16 : uint16info.max,
np.uint8 : uint8info.max,
np.bool_ : uint8info.max,
np.object_ : np.nan # oof
}
return na_values

na_values = _compute_na_values()

for k in list(na_values):
na_values[np.dtype(k)] = na_values[k]
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