Ilya V. Schurov ischurov

This is due to fact that you modify your list when iterating it. You can check what's going on with pythontutor.com visualizer or add some print statements like this:

    templist = ['', 'hello', '', 'hi', 'mkay', '', '']
    
    for i, element in enumerate(templist):
        print("Step", i)
        print('element is', repr(element), 'and templist is', templist)
        if element == '':
            print("element is empty")
            templist.remove(element)

	def decode_escaped_cp866(s):
	out = []
	for token in re.finditer(r"%([0-9A-F]{2})\|(.)", s):
	if token.group(1) is not None:
	out.append(bytes([int(token.group(1), 16)]))
	elif token.group(2) is not None:
	out.append(token.group(2).encode('utf-8'))
	return b"".join(out).decode('cp866')

	print(decode_escaped_cp866("%8C%A0%E0%A8%EF - %84%87"))

	def repr_long_str(s, maxlen=70, correction=-1, doprint=False):
	assert maxlen > 3
	cur = 0
	out = []
	while cur < len(s):
	end = cur + maxlen - 2 + correction
	while len(repr(s[cur:end])) > maxlen + correction:
	end -= 1
	out.append(repr(s[cur:end]))
	correction = 0


	<div style='visibility: hidden; display: none;'>
	\[
	\newcommand{\ph}{\varphi}
	\]
	</div>
	<h1 id="label_chap_notion_of_ODE"><span class="section__number">1. </span>Понятие дифференциального уравнения </h1><h2 id="label_h2_number_1"><span class="section__number">1. </span>Примеры моделей, приводящих к дифференциальным уравнениям

	</h2>Прежде, чем говорить о дифференциальных уравнения в общем виде, обсудим
	несколько простых примеров, в которых они возникают естественным образом.

	%matplotlib inline
	# to use in Jupyter

	from scipy.integrate import odeint
	import numpy as np
	def f(Z, t):
	# x = Z[0], y = Z[1]
	return [Z[1], -Z[0]]

	t = np.linspace(0, 10)

	import imaplib
	import time
	from email.mime.text import MIMEText
	from email.utils import formataddr
	import gspread
	from oauth2client.client import SignedJwtAssertionCredentials
	import json
	import pandas as pd

	import flickrapi # we're using http://stuvel.eu/flickrapi
	import glob

	api_key="xxx"
	api_secret="xxx"

	# get your own on https://www.flickr.com/services/api/

	flickr = flickrapi.FlickrAPI(api_key, api_secret)
	flickr.authenticate_via_browser(perms='write')