TypeError: must be str, not int

TypeError is the most common error that you may see while working with Python code. Let's see an example,

import time

n = 10;
print("Sleeping for " + n + " seconds..")
time.sleep(n)
print("Done!")

When you try executing the above code you will get such a stack trace,

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-8-9d9f3e4b3530> in <module>()
      2 
      3 n = 10;
----> 4 print("Sleeping for " + n + " seconds..")
      5 time.sleep(n)
      6 print("Done!")

TypeError: must be str, not int

Solution:

You need to cast the integer data type String using the str() function.

print("Sleeping for " + str(n) + " seconds..")