def load_dataframe_per_json_file(cls, glob_pattern, key="", nrows=None):
fnames = set(just.glob(glob_pattern))
name = glob_pattern + "_" + normalize_name(cls.__name__)
processed_files = get_processed_files(name)
to_process = fnames.difference(processed_files)
objects = []
if nrows is not None:
if not to_process:
to_process = list(processed_files)[-nrows:]
else:
to_process = list(to_process)[-nrows:]
if to_process:
print("processing {} files".format(len(to_process)))
for fname in to_process:
data = read_array_of_dict_from_json(fname, key, nrows)
data = cls.handle_dataframe_per_file(data, fname)
if data is None:
continue
objects.append(data)
data = pd.concat(objects)
if processed_files and nrows is None:
data = pd.concat((data, load_df(name)))
for x in ["time", "start", "end"]:
if x in data:
data = data.sort_values(x)
break
if nrows is None:
save_df(data, name)
save_processed_files(fnames | processed_files, name)
else:
data = load_df(name)
if nrows is not None:
data = data.iloc[-nrows:]
return data
def load_image_texts(cls, glob_pattern_s, nrows=None):
import pytesseract
from PIL import Image
if isinstance(glob_pattern_s, list):
fnames = set()
for glob_pattern in glob_pattern_s:
fnames.update(set(just.glob(glob_pattern)))
glob_pattern = "_".join(glob_pattern_s)
else:
fnames = set(just.glob(glob_pattern))
name = glob_pattern + "_" + normalize_name(cls.__name__)
processed_files = get_processed_files(name)
to_process = fnames.difference(processed_files)
objects = []
cache = get_cache("tesseract")
if nrows is not None:
if not to_process:
return load_df(name).iloc[-nrows:]
else:
to_process = list(to_process)[-nrows:]
if to_process:
for fname in to_process:
if fname in cache:
text = cache[fname]
else:
try:
text = pytesseract.image_to_string(
Image.open(just.make_path(fname)))
except OSError as e:
print("ERR", fname, e)
continue
cache[fname] = text
time = datetime_from_timestamp(os.path.getmtime(fname), "utc")
data = {
"text": text,
"path": fname,
"title": fname.split("/")[-1],
"time": time
}
objects.append(data)
data = pd.DataFrame(objects)
if processed_files and nrows is None:
data = pd.concat((data, load_df(name)))
for x in ["time", "start", "end"]:
if x in data:
data = data.sort_values(x)
break
if nrows is None:
save_df(data, name)
save_processed_files(fnames | processed_files, name)
else:
data = load_df(name)
if nrows is not None:
data = data.iloc[-nrows:]
return data
def load_object_per_newline(cls, fname, nrows=None):
"""
Iterates over a file containing an object per line (e.g. .jsonl or .txt).
Will only handle new lines not seen earlier; it detects this by storing the number-of-objects seen.
You should implement `object_to_row(cls, row)` on your class that returns a dictionary.
"""
data = []
name = fname + "_" + normalize_name(cls.__name__)
newline_count = get_newline_count(name)
for i, x in enumerate(just.iread(fname)):
if nrows is None:
if i < newline_count:
continue
row = cls.object_to_row(x)
if row is None:
continue
data.append(row)
# breaking at approx 5 rows
if nrows is not None and i > nrows:
break
if data:
data = pd.DataFrame(data)
if newline_count and nrows is None:
data = pd.concat((data, load_df(name)))
if nrows is None:
data = save_df(data, name)
n = i + 1
save_newline_count(n, name)
else:
data = load_df(name)
if nrows is not None:
data = data.iloc[-nrows:]
return data
def load_data_file_modified_time(cls,
fname,
key_name="",
nrows=None,
from_cache=True,
**kwargs):
"""
It will load from cache if filename is not changed since last run (and there is a cache).
If it has changed, it will reprocess and save it in cache (including the modified_time).
Handles csv, mbox and json currently.
key_name is only for json.
nrows is for enabling quickly loading a sample.
from_cache=False allows ignoring the cache and reprocessing the file.
Loading the csv, json or mbox file will yield you a DF
IMPORTANT: assumes you implement `handle_dataframe_per_file`
This is the post-processing required after the file is loaded, for e.g. converting time
dropping and adding columns.
"""
name = fname + "_" + normalize_name(cls.__name__)
modified_time = os.path.getmtime(os.path.expanduser(fname))
last_modified = get_last_mod_time(name)
if modified_time != last_modified or not from_cache:
if fname.endswith(".csv"):
data = pd.read_csv(fname,
error_bad_lines=False,
nrows=nrows,
**kwargs)
elif fname.endswith(".mbox"):
import mailbox
m = mailbox.mbox(fname)
data = pd.DataFrame(
[{l: x[l]
for l in ["from", "to", "date", "subject"]} for x in m])
else:
data = read_array_of_dict_from_json(fname, key_name, nrows,
**kwargs)
data = cls.handle_dataframe_per_file(data, fname)
if nrows is None:
save_df(data, name)
save_last_mod_time(modified_time, name)
else:
data = load_df(name, nrows)
if nrows is not None:
data = data.iloc[-nrows:]
return data
def load_json_file_modified_time(cls,
fname,
nrows=None,
from_cache=True,
**kwargs):
name = fname + "_" + normalize_name(cls.__name__)
modified_time = os.path.getmtime(os.path.expanduser(fname))
last_modified = get_last_mod_time(name)
if modified_time != last_modified or not from_cache:
data = just.read(fname)
data = cls.handle_json(data, **kwargs)
data = pd.DataFrame(data)
if nrows is None:
save_df(data, name)
save_last_mod_time(modified_time, name)
else:
data = load_df(name)
if nrows is not None:
data = data.iloc[-nrows:]
return data
def save_df(cls, df, name=None):
return save_df(df, name or cls.get_normalized_name())