Today I will go over four methods to generate a random hex string in Python. Firstly, from Python’s secrets module, we will use the function token_hex(n), where n specifies the number of bytes. The resulting hex string will be of length n * 2. Next, we will look at another function within the secrets module … Read more
Problem Formulation Given a string representation of a dictionary. How to convert it to a dictionary? Input: ‘{“1”: “hi”, “2”: “alice”, “3”: “python”}’ Output: {‘a’: 1, ‘b’: 2, ‘c’: 3} Method 1: eval() The built-in eval() function takes a string argument, parses it as if it was a code expression, and evaluates the expression. If … Read more
Problem Formulation Given a Unicode string representation of a dictionary. How to convert it to a dictionary? Input: u”{‘a’: 1, ‘b’: 2, ‘c’: 3}” Output: {‘a’: 1, ‘b’: 2, ‘c’: 3} Note: The u’string’ representation represents a Unicode string that was introduced in Python 3. This is redundant as all strings in Python 3 are … Read more
Problem Formulation If you print an octal number, Python uses the prefix ‘0o’ to indicate that it’s a number in the octal system and not in the decimal system like normal integers. However, if you already know that the output numbers are octal, you don’t necessarily need the ‘0o’ prefix. How to print oct numbers … Read more
Problem Formulation If you print a hexadecimal number, Python uses the prefix ‘0x’ to indicate that it’s a number in the hexadecimal system and not in the decimal system like normal integers. However, if you already know that the output numbers are hexadecimal, you don’t necessarily need the ‘0x’ prefix. How to print hex numbers … Read more
Problem Formulation If you print a binary number, Python uses the prefix ‘0b’ to indicate that it’s a number in the binary system and not in the decimal system like normal integers. However, if you already know that the output numbers are binary, you don’t necessarily need the ‘0b’ prefix. How to print binary numbers … Read more
Half an hour ago, my friend and coauthor of the textbook “Coffee Break NumPy” asked me the following question via WhatsApp: Problem Formulation How would you solve the problem of interleaving two strings in Python: Input: String s1= “AAA” and string s2 = “BBBBB” Output: String s=”ABABABBB” Being obsessed with finding the most Pythonic way … Read more
Note that this tutorial concerns NumPy arrays. To learn how to print lists without brackets check out this tutorial: How to Print a List Without Brackets in Python? Problem Formulation Given a NumPy array of elements. If you print the array to the shell using print(np.array([1, 2, 3])), the output is enclosed in square brackets … Read more
Problem Formulation Given a set of elements. If you print the list to the shell using print({1, 2, 3}), the output is enclosed in curly brackets (braces) like so: {1, 2, 3}. But you want the set without brackets like so: 1, 2, 3. How to print the set without enclosing brackets? Method 1: Unpacking … Read more
Problem Formulation Given a tuple of elements. If you print the tuple to the shell using print((1, 2, 3)), the output is enclosed in parentheses like so: (1, 2, 3). But you want the list without brackets like so: 1, 2, 3. How to print the tuple without enclosing parentheses? Method 1: Unpacking The asterisk … Read more
Problem Formulation Given a dictionary of key value pairs in Python. If you print the dictionary to the shell using print({‘a’: 1, ‘b’: 2}), the output is enclosed in curly brackets (braces) like so: {‘a’: 1, ‘b’: 2}. But you want the dictionary without brackets like so: ‘a’: 1, ‘b’: 2. How to print the … Read more
Problem Formulation Given a list of elements. If you print the list to the shell using print([1, 2, 3]), the output is enclosed in square brackets like so: [1, 2, 3]. But you want the list without brackets like so: 1, 2, 3. How to print the list without enclosing brackets? Method 1: Unpacking The … Read more