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process_file.py
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process_file.py
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import csv
import os
from typing import List, Any, IO, Iterable
from config import TXT_TYPE, CSV_TYPE, READ_OPT, WRITE_OPT, APPEND_OPT, NUM_START_WITH, DELIM, ENCOD, HIDDEN_FILE
from process_row import check_frmt_row, process_row
def create_dir(path_: str) -> None:
"""
Creating a folder on the passed path.
:param path_: A string containing the path to the new folder.
:return:
"""
if not os.path.exists(path_):
os.mkdir(path_)
def delete_file(file_path_: str) -> None:
"""
Delete a file from the system.
:param file_path_: A string containing the path to the file.
:return:
"""
if os.path.exists(file_path_):
os.remove(file_path_)
def check_file(fold_path_: str, file_path_: str) -> bool:
"""
Check the file configurations to see if it can be processed.
Basic conditions:
- The folder exists in the system;
- The file is in the folder;
- The file exists in the system;
- The file does not start with a dot;
- The file extension is on the list of files available for processing.
:param fold_path_: A string containing the path to the folder.
:param file_path_: A string containing name of the file.
:return: True if the file has suitable configurations, otherwise False.
"""
if os.path.isdir(fold_path_) and os.path.exists(os.path.join(fold_path_, file_path_)):
return file_path_.endswith((TXT_TYPE, CSV_TYPE)) and not file_path_.startswith(HIDDEN_FILE)
return False
def get_files_lst_in_dir(fold_path_: str) -> List[str]:
"""
Gets a list of paths to files in a specified folder.
:param fold_path_: A string containing the path to the folder.
:return: List of paths to files.
"""
return [os.path.join(fold_path_, file) for file in os.listdir(fold_path_) if check_file(fold_path_, file)]
def sort_fast(lst_: List[int]) -> List[int]:
"""
Sorts a list of integers using the quick sort algorithm.
:param lst_: A list of integers.
:return: A sorted list of integers.
"""
def _partition(items: List, low: int, high: int) -> int:
"""
Partitioning a list of integers.
:param items: A list of integers.
:param low: A number indicating the start of the list.
:param high: A number indicating the end of the list.
"""
pivot, i, j = items[(low + high) // 2], low - 1, high + 1
while True:
i += 1
while items[i] < pivot:
i += 1
j -= 1
while items[j] > pivot:
j -= 1
if i >= j:
return j
items[i], items[j] = items[j], items[i]
def _quick_sort(nums: List[int]) -> None:
"""
Quick sort algorithm.
:param nums: A list of integers.
:return:
"""
def quick_sort(items: List, low: int, high: int) -> None:
"""
Quick sort algorithm.
:param items: A list of integers.
:param low: A number indicating the start of the list.
:param high: A number indicating the end of the list.
:return:
"""
if low < high:
split_index = _partition(items, low, high)
quick_sort(items, low, split_index)
quick_sort(items, split_index + 1, high)
quick_sort(nums, 0, len(nums) - 1)
_quick_sort(lst_)
return lst_
def clean_fast(lst_: List[int]) -> List[int]:
"""
Cleaning a list of integers.
:param lst_: A list of integers.
:return: A list of integers without duplicates and starting with the number 7.
"""
values = []
count = 0
while count < len(lst_):
if (not values or lst_[count] != values[-1]) and str(lst_[count]).startswith(NUM_START_WITH):
values.append(lst_[count])
count += 1
return values
def get_lst_of_msisdn(file_path_: str) -> List[int] | None:
"""
Reading a file and getting a list of data.
:param file_path_: A string containing the path to the file.
:return: A list of data.
"""
def _read_file(file_: IO) -> List[str] | List[List[str]]:
"""
Reading a file.
:return: A list with the data retrieved from the file.
"""
def read_csv() -> Iterable[List[str]]:
"""
Reading a csv file.
:return: A list with the data retrieved from the file.
"""
return csv.reader(file_, delimiter=DELIM)
def read_txt() -> List[str]:
"""
Reading a txt file.
:return: A list with the data retrieved from the file.
"""
return file_.readlines()
return read_csv() if file_path_.endswith(CSV_TYPE) else read_txt()
def _open_file() -> IO:
"""
Opening a file.
:return: A list with the data retrieved from the file.
"""
def open_csv() -> IO:
"""
Opening a csv file.
:return: A file object.
"""
return open(file_path_, newline="")
def open_txt() -> IO:
"""
Opening a txt file.
:return: A file object.
"""
return open(file_path_, READ_OPT)
return open_csv() if file_path_.endswith(CSV_TYPE) else open_txt()
def _create_lst_of_msisdn() -> List[int]:
"""
Creating a list of MSISDN.
:return: A list with msisdn retrieved from the file.
"""
with _open_file() as file:
return [int(process_row(row)) for row in _read_file(file) if check_frmt_row(row)]
lst_of_msisdn = _create_lst_of_msisdn()
if lst_of_msisdn:
return clean_fast(sort_fast(lst_of_msisdn))
return None
def save_file(file_path_: str, msisdn_lst_: List[str], space_: str, file_type_: str = CSV_TYPE, limit_: int = None,
first_row_: str = None, file_to_write: IO = None) -> None:
"""
Save data to file.
:param file_path_: Path to file.
:param msisdn_lst_: List of msisdn.
:param file_type_: File extension.
:param limit_: Limit of bytes in file.
:param first_row_: First row in file.
:param file_to_write: File to write.
:param space_: Ad space for witch file creating.
:return:
"""
def _open_file(path_to_open_: str) -> None:
"""
Open file.
:param path_to_open_: Path to file.
:return: A file object.
"""
def open_csv() -> IO:
"""
Open csv file.
:return: A file object.
"""
return open(path_to_open_, APPEND_OPT, newline="", encoding=ENCOD)
def open_txt() -> IO:
"""
Open txt file.
:return: A file object.
"""
return open(path_to_open_, WRITE_OPT)
nonlocal file_to_write
file_to_write = open_txt() if file_type_ == TXT_TYPE else open_csv()
def _close_file() -> None:
"""
Close file.
:return:
"""
if file_to_write is not None:
file_to_write.close()
def _write_first_row() -> None:
"""
Write first row in file.
:return:
"""
if first_row_:
_write_row(first_row_)
def _write_row(msisdn_hash_: Any) -> None:
"""
Write row in file.
:param msisdn_hash_: Row to write.
:return:
"""
if file_type_ == TXT_TYPE:
file_to_write.write(f"{msisdn_hash_}\n")
else:
csv.writer(file_to_write).writerow([msisdn_hash_])
def _check_limit() -> bool:
"""
Check limit of bytes in file.
:return: True if limit is reached.
"""
return (limit_ is not None) and (file_to_write.tell() >= limit_)
def _change_file_name() -> str:
"""
Change file name.
:return: New file name.
"""
return file_path_.replace(file_path_[-4:], f"_{count_f}_{space_}{file_type_}")
def _division_into_parts() -> None:
"""
Division into parts.
:return:
"""
nonlocal count_f
if (file_to_write is None) or _check_limit():
_close_file()
_open_file(_change_file_name())
_write_first_row()
count_f += 1
count_r, count_f = 0, 1 # count_r - count of rows, count_f - count of files
while count_r < len(msisdn_lst_):
_division_into_parts()
_write_row(msisdn_lst_[count_r])
count_r += 1
_close_file()