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diff --git a/en/lessons/from-html-to-list-of-words-1.md b/en/lessons/from-html-to-list-of-words-1.md
index 6651e8b587..8f31f975bc 100755
--- a/en/lessons/from-html-to-list-of-words-1.md
+++ b/en/lessons/from-html-to-list-of-words-1.md
@@ -168,6 +168,7 @@ copy the following code into your file.
 # obo.py
 
 def stripTags(pageContents):
+    pageContents = str(pageContents)
     startLoc = pageContents.find("<p>")
     endLoc = pageContents.rfind("<br/>")
 
diff --git a/en/lessons/from-html-to-list-of-words-2.md b/en/lessons/from-html-to-list-of-words-2.md
index d48af6ab79..de0519d576 100755
--- a/en/lessons/from-html-to-list-of-words-2.md
+++ b/en/lessons/from-html-to-list-of-words-2.md
@@ -35,7 +35,7 @@ doi: 10.46430/phen0007
 In this lesson, you will learn the Python commands needed to implement
 the second part of the algorithm begun in the [From HTML to a List of
 Words (part 1)][]. The first half of the algorithm gets the content of
-an HTML page and saves only the content betwee the first `<p>` and the last `<br/>`
+an HTML page and saves only the content between the first `<p>` and the last `<br/>`
 tags. The second half of the algorithm does the following:
 
 -   Look at every character in the *pageContents* string, one character at
@@ -167,6 +167,7 @@ version as well to make sure that your program does what ours does.
 ``` python
 # obo.py
 def stripTags(pageContents):
+    pageContents = str(pageContents)
     startLoc = pageContents.find("<p>")
     endLoc = pageContents.rfind("<br/>")
 
diff --git a/en/lessons/normalizing-data.md b/en/lessons/normalizing-data.md
index f92689e9ac..c565d40c92 100755
--- a/en/lessons/normalizing-data.md
+++ b/en/lessons/normalizing-data.md
@@ -116,7 +116,7 @@ import urllib.request, urllib.error, urllib.parse, obo
 url = 'http://www.oldbaileyonline.org/browse.jsp?id=t17800628-33&div=t17800628-33'
 
 response = urllib.request.urlopen(url)
-html = response.read()
+html = str(response.read())
 text = obo.stripTags(html).lower() #add the string method here.
 wordlist = text.split()
 
diff --git a/en/lessons/output-data-as-html-file.md b/en/lessons/output-data-as-html-file.md
index 5a052b13ec..3bc686914b 100755
--- a/en/lessons/output-data-as-html-file.md
+++ b/en/lessons/output-data-as-html-file.md
@@ -171,7 +171,7 @@ def wrapStringInHTMLMac(program, url, body):
 
     now = datetime.datetime.today().strftime("%Y%m%d-%H%M%S")
     filename = program + '.html'
-    f = open(filename,'wb')
+    f = open(filename,'w')
 
     wrapper = """<html>
     <head>
diff --git a/es/lecciones/de-html-a-lista-de-palabras-1.md b/es/lecciones/de-html-a-lista-de-palabras-1.md
index b18b19fde5..ef221f53e1 100644
--- a/es/lecciones/de-html-a-lista-de-palabras-1.md
+++ b/es/lecciones/de-html-a-lista-de-palabras-1.md
@@ -109,6 +109,7 @@ Crea un nuevo archivo llamado *obo.py* y guárdalo en tu carpeta *programming-hi
 # obo.py
 
 def quitarEtiquetas(contenidoPagina):
+    contenidoPagina = str(contenidoPagina)
     lugarInicio = contenidoPagina.find("<p>")
     lugarFin = contenidoPagina.rfind("<br/>")
 
diff --git a/es/lecciones/de-html-a-lista-de-palabras-2.md b/es/lecciones/de-html-a-lista-de-palabras-2.md
index eeed9ac845..e7a80c3856 100644
--- a/es/lecciones/de-html-a-lista-de-palabras-2.md
+++ b/es/lecciones/de-html-a-lista-de-palabras-2.md
@@ -120,6 +120,7 @@ Tu rutina debe verse ligeramente diferente y, mientras que funcione, todo está
 ``` python
 # obo.py
 def quitarEtiquetas(contenidoPagina):
+    contenidoPagina = str(contenidoPagina)
     lugarInicio = contenidoPagina.find("<p>")
     lugarFin = contenidoPagina.rfind("<br/>")
 
diff --git a/es/lecciones/normalizar-datos.md b/es/lecciones/normalizar-datos.md
index 2e1b9435b8..ac9b81daa5 100644
--- a/es/lecciones/normalizar-datos.md
+++ b/es/lecciones/normalizar-datos.md
@@ -95,7 +95,7 @@ import urllib.request, urllib.error, urllib.parse, obo
 url = 'http://www.oldbaileyonline.org/browse.jsp?id=t17800628-33&div=t17800628-33'
 
 respuesta = urllib.request.urlopen(url)
-html = respuesta.read()
+html = str(respuesta.read())
 texto = obo.quitarEtiquetas(html).lower() #incluye el metodo de cadena aqui
 listaPalabras = texto.split()
 
diff --git a/es/lecciones/salida-de-datos-como-archivo-html.md b/es/lecciones/salida-de-datos-como-archivo-html.md
index 20b92af09c..67ec93dad3 100644
--- a/es/lecciones/salida-de-datos-como-archivo-html.md
+++ b/es/lecciones/salida-de-datos-como-archivo-html.md
@@ -122,7 +122,7 @@ def envuelveCadenaenHTMLMac(programa, url, body):
 
     ahora = datetime.datetime.today().strftime("%Y%m%d-%H%M%S")
     nombreArchivo = programa + '.html'
-    f = open(nombreArchivo,'wb')
+    f = open(nombreArchivo,'w')
 
     wrapper = """<html>
     <head>