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tools for common operations in a module

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The module olutils provide common tools to simplify daily coding. It includes:

  • object storing (.csv, .json, .pickle, .txt)
  • convenient collection (deep defaultdict, lazy list, identity/prod functions)
  • conversion functions (for datetime, dictionaries, errors)
  • sequencing helpers (iteration with progress display, wait until predicate)
  • parameter management
  • and more...


One can install olutils using pip install command: pip install olutils


Object Storing

  • Storage: save and load
import olutils

my_dict = {'key_1': "value_1", 'key_2': 2}
my_rows = [{'col_1': 11, 'col_2': 21}, {'col_1': 21, 'col_2': 22}]

# Saving objects in output directory (automatically created), "output/my_dict.json"), "output/my_rows.csv"), "output/my_rows.unknown", mthd="json")

# Loading objects from save outputs
my_loaded_dict = olutils.load("output/my_dict.json")
my_loaded_rows = olutils.load("output/my_rows.csv")
my_loaded_rows_ = olutils.load("output/my_rows.unknown", mthd="json")


  • deepdefaultdict
import olutils
from olutils.conversion import str2dt

# Building a deep default dict with datetimes as values
flights = olutils.deepdefaultdict(lambda x: None, depth=2)

# Filling it
flights['Paris-NY']['departure'] = str2dt("2019-01-15 08:00+01:00")
flights['Paris-NY']['arrival'] = str2dt("2019-01-15 10:30-05:00")
flights['NY-Paris']['departure'] = str2dt("2019-01-17 23:00-05:00")
flights['NY-Paris']['arrival'] = str2dt("2019-01-15 11:00+01:00")

  • LazyList
import olutils

print(olutils.LazyList(range(10000), 10))
  • functions: prod and identity
import olutils

# Operations
assert[2, 7]) == 14
assert olutils.identity(1) == 1
  • singleton:
import olutils

class MyClass(metaclass=olutils.Singleton):

instance = MyClass()
assert instance is MyClass()


  • Explicit iteration
import olutils

print("Iterating on very long iterable:")
for elem in olutils.countiter(range(int(10e6)), vbatch=100, prefix=". "):
    # One-Line display of progress every 100 iteration
  • Compare
import olutils

# Comparison
l1 = [1, 2, "hi", "bye"]
l2 = [3, "bye", "bye bye", 2]
assert olutils.content_diff(l1, l2) == {
    'common': {2, "bye"},
    'minus': {1, "hi"},
    'plus': {3, "bye bye"},
  • Pretty displays
import olutils

assert olutils.err2str(ValueError("Message")) == "ValueError - Message"
l = [1, 2, 3, 4, 5]
imp_l = olutils.lazy_content(l, 4)
assert str(imp_l) == '[1, 2, Ellipsis, 5]'
dic = {
    'values': l,
    'info': {
        'name': "Some example",
        'also': "This is awesome (kinda)",
print(f"Dictionary used: {dic}")
print(f"Dictionary to pretty string:")
def leafconv(x):
    return (
        str(olutils.lazy_content(x, 5))
        if isinstance(x, list)
        else str(x)
print(olutils.dict2str(dic, leafconv=leafconv))

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