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In Python, we can read and write to files using the with statement with the open() function. The open() function opens a file and returns a file object. The file object exposes a file-oriented API, with methods such as read() or write() to the underlying resource. If...

In Python, you can use the datetime library to work with dates and times. The datetime.strftime() method converts a datetime object containing a date and time to different string formats. You cannot call strftime() on a string object because strftime() is not a method...

In Python, a Pandas Series is a one-dimensional labelled array capable of holding data of any type. Pandas Series is the same as a column in an Excel spreadsheet. If you have string entries in a Series object that you want to split, you cannot use the string method...

In Python, a set is an unordered collection of unique elements. The append() method belongs to the List data type. If you try to call the append() method on a set to add elements to the set, you will raise the AttributeError: 'set' object has no attribute 'append'. To...

The built-in raw_input() function in Python 2 does not exist in Python 3. In Python 3, we can use the function input() to collect input from the user of a program If you try to use raw_input() in a Python 3 program, you will raise the NameError: name 'raw_input' is...

The built-in xrange() method in Python 2 does not exist in Python 3. In Python 3, we can use the function range() to produce a range of numbers. If you try to use xrange() in a Python 3 program, you will raise the NameError: name 'xrange' is not defined. To solve this...

In Python, strings are immutable arrays of bytes representing Unicode characters. The pop() method belongs to the List data type and removes the element at the specified position. If you try to call pop() on a string, you will raise the AttributeError: 'str' object...

In Python, you cannot access values inside a set using indexing syntax. A set is an unordered collection of unique elements. Because a set is unordered, they do not record element position or insertion order. Therefore sets do not support indexing, slicing or other...

We use lists to store multiple data values in a single variable. You cannot make a real copy of a list by typing list1 = list2, because list2 will be a reference to list1 =, and if you make changes to list1 they will be made to list2. Instead, we can use the built-in...