Python Capitulo uno curso de programacion
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Python Capitulo uno curso de programacion
- 2. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Intro
- 3. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • Introduction • The fundamentals of computer programming • Setting up your programming environment • Compilation vs. interpretation • Introduction to Python Module 1
- 4. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • Data types and the basic methods of formatting, converting, inputting and outputting data; • Literals • Integers, floats, strings, Boolean, octal, hexadecimal • Operators • + (addition), - (subtraction), * (multiplication), / (classic division), % (modulus), ** (exponentiation), // (floor) • Expressions, unary, binary, hierarchy of priorities, exponentiation • Variables. Module 2
- 5. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Boolean values if-elif-else instructions The while and for loops Logical and bitwise operations >, <, >=, <=, ==, >>, << and, or, not, xor -> & (ampersand), | (bar), ~ (tilde), ^ (caret) Lists and arrays Sort, operations on list Module 3
- 6. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • Defining and using functions • built-in, pre-installed, user-defines, lambda • Different ways of passing arguments • Parameters, arguments, return • Name scopes • Tuples and dictionaries Module 4
- 7. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • Module 1 • Module 2 • Module 3 • Module 4 PCEP – Python Certified Entry Programmer
- 8. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • Python modules: their rationale, function, how to import them in different ways, and present the content of some standard modules provided by Python; • The way in which modules are coupled together to make packages. • The concept of an exception and Python's implementation of it, including the try-except instruction, with its applications, and the raise instruction. • Strings and their specific methods, together with their similarities and differences compared to lists. Module 5
- 9. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • The object-oriented approach - foundations • Classes, methods, objects, and the standard objective features • Exception handling • Working with files Module 6
- 10. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • Module 1 • Module 2 • Module 3 • Module 4 • Module 5 • Module 6 PCAP – Python Certified Associate Programmer
- 11. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Programming Absolute basics
- 12. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • Language is a means (and a tool) for expressing and recording thoughts: • Body language: it's possible to express your deepest feelings very precisely without saying a word. • Mother tongue: which you use to manifest your will and to think about reality. • Computers have their own language, too, called machine language, which is very rudimentary. • A complete set of known commands is called an Instruction List (IL) • Different types of computers can vary depending on the size of your ILs and the instructions can be completely different on different models. Natural languages vs. programming languages
- 13. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • AN ALPHABET A set of symbols • A LEXIS A dictionary • A SYNTAX A set of rules (formal or informal) • SEMANTICS A set of rules determining if a certain phrase makes sense What makes a language?
- 14. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • Computer language is far from a human mother tongue. We need (both computers and humans) a language or a bridge between the two different worlds. • A language in which humans can write their programs and a language that computers may use to execute the programs. • Such languages are high-level programming languages. They use symbols, words and conventions readable to humans. These languages enable humans to express commands to computers • A program written in a high-level programming language is called a source code (in contrast to the machine code executed by computers) or source file. What makes a language?
- 15. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential There are two different ways of transforming a program from a high-level programming language into machine language: Compilation vs. interpretation
- 16. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • https://www.youtube.com/watch?v=hPYCSu-_LPc&t=343s Video: Compilation vs. interpretation (cont.)
- 17. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Compilation vs. interpretation COMPILATION INTERPRETATION ADVANTAGES • The execution of the translated code is usually faster. • Only the user has to have the compiler - the end-user may use the code without it. • The translated code is stored using machine language, your own inventions and programming tricks are likely to remain your secret. • You can run the code as soon as you complete it - there are no additional phases of translation; • The code is stored using programming language, not the machine one - this means that it can be run on computers using different machine languages; you don't compile your code separately for each different architecture. DISADVANTAGE S • The compilation itself may be a very time- consuming process - you may not be able to run your code immediately after any amendment; • You have to have as many compilers as hardware platforms you want your code to be run on. • Don't expect that interpretation will ramp your code to high speed - your code will share the computer's power with the interpreter, so it can't be really fast; • Both you and the end user have to have the interpreter to run your code.
- 18. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • Easy to learn • Easy to teach • Easy to use • Easy to understand • Easy to obtain, install and deploy What makes Python special?
- 19. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • low-level programming (sometimes called "close to metal" programming): if you want to implement an extremely effective driver or graphical engine, you wouldn't use Python; • applications for mobile devices: although this territory is still waiting to be conquered by Python, it will most likely happen someday. When not to use Python
- 20. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential • Python 3 is the current version of the language. It's going through its own evolution path, creating its own standards and habits. There is more than one Python • Python 2 is an older version of the original Python. Its development has since been intentionally stalled, however the updates are issued on a regular basis, but they are not intended to modify the language in any significant way.
- 21. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential In addition to Python 2 and Python 3, there is more than one version Versions of Python • Python aka Cpython • Cython • Jython • PyPy and RPython
- 22. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential https://www.python.org/downloads/ How to get Python and how to get to use it
- 23. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Demo – How to use Python IDLE
Editor's Notes
- 6. In Python strings the backslash (\) is a special character which announces that the next character has a different meaning, e.g., \n (the newline character) starts a new output line. 7. Positional arguments are the ones whose meaning is dictated by their position, e.g., the second argument is outputted after the first, the third is outputted after the second, etc. 8. Keyword arguments are the ones whose meaning is not dictated by their location, but by a special word (keyword) used to identify them. 9. The end and sep parameters can be used for formatting the output of the print() function. The sep parameter specifies the separator between the outputted arguments (e.g., print("H", "E", "L", "L", "O", sep="-"), whereas the end parameter specifies what to print at the end of the print statement.
- Computer programming is the act of composing the selected programming language's elements in the order that will cause the desired effect. The effect could be different in every specific case - it's up to the programmer's imagination, knowledge and experience. Of course, such a composition has to be correct in many senses: alphabetically - a program needs to be written in a recognizable script, such as Roman, Cyrillic, etc. lexically - each programming language has its dictionary and you need to master it; thankfully, it's much simpler and smaller than the dictionary of any natural language; syntactically - each language has its rules and they must be obeyed; semantically - the program has to make sense. Unfortunately, a programmer can also make mistakes with each of the above four senses. Each of them can cause the program to become completely useless. Let's assume that you've successfully written a program. How do we persuade the computer to execute it? You have to render your program into machine language. Luckily, the translation can be done by a computer itself, making the whole process fast and efficient.
- What does this all mean for you? Python is an interpreted language. This means that it inherits all the described advantages and disadvantages. Of course, it adds some of its unique features to both sets. If you want to program in Python, you'll need the Python interpreter. You won't be able to run your code without it. Fortunately, Python is free. This is one of its most important advantages. Due to historical reasons, languages designed to be utilized in the interpretation manner are often called scripting languages, while the source programs encoded using them are called scripts.
- DRAWBACKS - it's not a speed demon - Python does not deliver exceptional performance; - in some cases it may be resistant to some simpler testing techniques - this may mean that debugging Python's code can be more difficult than with other languages; fortunately, making mistakes is always harder in Python. it's easy to learn - the time needed to learn Python is shorter than for many other languages; this means that it's possible to start the actual programming faster; it's easy to teach - the teaching workload is smaller than that needed by other languages; this means that the teacher can put more emphasis on general (language-independent) programming techniques, not wasting energy on exotic tricks, strange exceptions and incomprehensible rules; it's easy to use for writing new software - it's often possible to write code faster when using Python; it's easy to understand - it's also often easier to understand someone else's code faster if it is written in Python; it's easy to obtain, install and deploy - Python is free, open and multiplatform; not all languages can boast that.
- Python rivals Python has two direct competitors, with comparable properties and predispositions. These are: Perl - a scripting language originally authored by Larry Wall; Ruby - a scripting language originally authored by Yukihiro Matsumoto.
- Stalled=estancado Todos los ejemplos de código que encontrarás durante el curso se han probado con Python 3.4, Python 3.6 y Python 3.7.
- PSF (Python Software Foundation)