text: #
  # Copyright (c) 2019, Neptune Labs Sp. z o.o.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  #
  import datetime
  import random
  import string
  import uuid
  
  
  def a_string():
      char_set = string.ascii_letters
      return ''.join(random.sample(char_set * 10, 10))
  
  
  def a_uuid_string():
      return str(uuid.uuid4())
  
  
  def a_string_list(length=2):
      return [a_string() for _ in range(0, length)]
  
  
  def a_timestamp():
      return datetime.datetime.now()
  
  def sort_df_by_columns(df):
      df = df.reindex(sorted(df.columns), axis=1)
      return df
  