programminghistorian · svmelton · Jan 22, 2020 · Jan 20, 2020 · Jan 20, 2020 · Jan 20, 2020
diff --git a/assets/python-lessons1.zip b/assets/python-lessons1.zip
diff --git a/assets/python-lessons2.zip b/assets/python-lessons2.zip
diff --git a/assets/python-lessons3.zip b/assets/python-lessons3.zip
diff --git a/assets/python-lessons4.zip b/assets/python-lessons4.zip
diff --git a/assets/python-lessons5.zip b/assets/python-lessons5.zip
diff --git a/assets/python-lessons6.zip b/assets/python-lessons6.zip
diff --git a/assets/python-lessons7.zip b/assets/python-lessons7.zip
diff --git a/assets/python-lessons8.zip b/assets/python-lessons8.zip
diff --git a/assets/python-lessons9.zip b/assets/python-lessons9.zip
diff --git a/en/lessons/creating-and-viewing-html-files-with-python.md b/en/lessons/creating-and-viewing-html-files-with-python.md
@@ -83,7 +83,7 @@ three quotation marks (see below).
 ``` python
 # write-html.py
 
-f = open('helloworld.html','w')
+f = open('helloworld.html','wb')
 
 message = """<html>
 <head></head>
@@ -133,7 +133,7 @@ want something inside the directory (rather than the directory itself).
 # write-html-2-mac.py
 import webbrowser
 
-f = open('helloworld.html','w')
+f = open('helloworld.html','wb')
 
 message = """<html>
 <head></head>
@@ -158,7 +158,7 @@ filename path correctly.
 
 import webbrowser
 
-f = open('helloworld.html','w')
+f = open('helloworld.html','wb')
 
 message = """<html>
 <head></head>

diff --git a/en/lessons/from-html-to-list-of-words-2.md b/en/lessons/from-html-to-list-of-words-2.md
@@ -244,7 +244,7 @@ And whenever you’ve needed to read from or write to a file, you’ve used
 a special file handle like *f* in the example below.
 
 ``` python
-f = open('helloworld.txt','w')
+f = open('helloworld.txt','wb')
 f.write('hello world')
 f.close()
 ```

diff --git a/en/lessons/output-data-as-html-file.md b/en/lessons/output-data-as-html-file.md
@@ -170,7 +170,7 @@ def wrapStringInHTMLMac(program, url, body):
 
     now = datetime.datetime.today().strftime("%Y%m%d-%H%M%S")
     filename = program + '.html'
-    f = open(filename,'w')
+    f = open(filename,'wb')
 
     wrapper = """<html>
     <head>
@@ -203,7 +203,7 @@ def wrapStringInHTMLWindows(program, url, body):
     now = datetime.datetime.today().strftime("%Y%m%d-%H%M%S")
 
     filename = program + '.html'
-    f = open(filename,'w')
+    f = open(filename,'wb')
 
     wrapper = """<html>
     <head>

diff --git a/en/lessons/working-with-text-files.md b/en/lessons/working-with-text-files.md
@@ -116,7 +116,7 @@ it as `file-output.py`.
 
 ``` python
 # file-output.py
-f = open('helloworld.txt','w')
+f = open('helloworld.txt','wb')
 f.write('hello world')
 f.close()
 ```
@@ -159,7 +159,7 @@ foobar, Foobar and FOOBAR would all be different variables.
 
 When you run this program, the `open` method will tell your computer to
 create a new text file `helloworld.txt` in the same folder as you have
-saved the `file-output.py` program. The *w parameter* says that you intend
+saved the `file-output.py` program. The *wb parameter* says that you intend
 to write content to this new file using Python.
 
 Note that since both the file name and the parameter are surrounded by

diff --git a/en/lessons/working-with-web-pages.md b/en/lessons/working-with-web-pages.md
@@ -229,7 +229,7 @@ url = 'http://www.oldbaileyonline.org/browse.jsp?id=t17800628-33&div=t17800628-3
 response = urllib.request.urlopen(url)
 webContent = response.read()
 
-f = open('obo-t17800628-33.html', 'w')
+f = open('obo-t17800628-33.html', 'wb')
 f.write(webContent)
 f.close
 ```