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Which one is better, php or Python? What are the differences between php and Python? Many friends will ask such a question, so today the php Chinese website will tell you about the difference between php and Python. I believe you will make some judgments after reading this article.
First of all, let’s take a look at the difference between php and Python applications:
php is a general open source scripting language. The syntax absorbs the characteristics of C language, Java and Perl, which is easy to learn and widely used. It is mainly suitable for the field of Web development.
Python is mainly used for system operation and maintenance, monitoring, crawlers, queue tasks, etc. Therefore, Python is easier to use outside the field of web development.
Secondly, let’s take a look at the difference between php and Python syntax:
Note: python is a strongly typed language, and php is a weakly typed language
1. The difference between the output syntax of php and Python:
php: echo can output multiple variables; print () only outputs one variable, and the return value is 1 on success and 0 on failure; print_r() only outputs an array; die() outputs first, then shuts down; printf() Formatted output string; var_dump() can determine the type and length of a variable and output the number of variables.
Python: print defaults to line wrapping. If not, add a comma.
2. The difference between php and Python variables:
php starts with the "$" identifier; for example: $a = 0 is defined.
Python is defined directly; for example: a=0.
3. The difference between PHP and Python arrays:
PHP arrays are relatively simple and unified, that is, array; they include ordinary arrays and associative arrays.
// 定义 $arr = array('Michael', 'Bob', 'Tracy'); // 调用方式 echo $arr[0] // Michael // 数组追加 array_push($arr, "Adam"); // array('Michael', 'Bob', 'Tracy','Adam');
Python arrays can be divided into lists [], tuples (), dictionaries {}, and sets ([]). The formats are changeable and the usage is flexible.
list (linked list) : Ordered items, search by index, use square brackets "[]";
test_list = [1, 2, 3, 4, 'Oh']
tuple (tuple) : Tuples bring together various objects and cannot be modified. Search by index, use brackets "()";
test_tuple = (1, 2, 'Hello', (4, 5))
dict (dictionary) : A dictionary is a The combination of group key (key) and value (value), search by key (key), no order, use curly brackets "{}";
test_dict = {'Wang' : 1, 'Hu' : 2, 'Liu' : 4}set (set): Unordered, elements only appear once, automatic deduplication, use "set([])"
test_set = set(['Wang', 'Hu', 'Liu', 4, 'Wang'])
4. The difference between conditional judgment statements and loop statements between PHP and Python:
The difference between conditional judgment statements between php and Python:
Example: The judgment statement of php is:
if($age = '5'){
echo "小孩";
}else if($age < 25 and $age > 14){
echo "青少年";
}else{
echo "空";
}The judgment statement of Python is:
sex = ''
if sex == 'man':
print('男')
elif sex == 'women':
print('女')
else:
print('空') The difference between loop statements between php and Python:
Example: The loop statement of php is:
$arr = array('a' => '苹果', 'b' =>'香蕉', 'c' => '梨子', 'd' => '水果');
foreach ($arr as $key => $value){
echo "数组key:".$key."<br>";
echo "key对应的value:".$value."<br>";
}The loop statement of Python is:
arr = {'a': '苹果', 'b': '香蕉', 'c': '梨子', 'd': '水果'}
# 第一种
for (key,value) in arr.items():
print("这是key:" + key)
print("这是key的value:" + value)
# 第二种
for key in arr:
print("这是key:" + key)
print("这是key的value:" + arr[key])5. The difference between php and Python function syntax:
php function syntax:
function calc($number1, $number2 = 10)
{
return $number1 + $number2;
}
print(calc(7));Python function syntax:
def calc(number1, number2 = 10):
sum = number1 + number2
return sum
print(calc(7))Finally we come Take a look at the performance comparison between php and Python:
php test:
<?php
function fibonacci($i){
if($i<2) return $i;
return fibonacci($i-2) + fibonacci($i-1);
}
echo fibonacci(34);php5.6 test is as follows:
qiangjian@localhost:/works/learnCPP$ php -v && time php fib.php PHP 5.6.28 (cli) (built: Dec 6 2016 12:38:54) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies 5702887 real 0m2.307s user 0m2.278s sys 0m0.017s
php7 test is as follows:
qiangjian@localhost:/works/learnCPP$ php -v && time php fib.php PHP 7.1.2 (cli) (built: Feb 17 2017 10:52:17) ( NTS ) Copyright (c) 1997-2017 The PHP Group Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies 5702887 real 0m0.815s user 0m0.780s sys 0m0.015s
Python test:
def fibonacci(i):
if i<2:
return i
return fibonacci(i-2) + fibonacci(i-1)
print(fibonacci(34))python2.7 test is as follows:
qiangjian@localhost:/works/learnCPP$ python2 -V && time python2 ./fib.py Python 2.7.13 5702887 real 0m2.651s user 0m2.594s sys 0m0.027s
python3.5 test is as follows:
qiangjian@localhost:/works/learnCPP$ python3 -V && time python3 ./fib.py Python 3.5.1 5702887 real 0m3.110s user 0m2.982s sys 0m0.026s
It can be seen from the above test that python becomes slower as it is upgraded, and many syntaxes are incompatible. It is good to write algorithms and small programs in daily life; the speed of php7 and 5 in php is very different, and it feels not It's like a program, and it's making great progress.
Of course, all the above content is just a simple comparison between php and python. There are many things that have not been written out, but it can be seen that php and python each have their own advantages and disadvantages. The above is the entire content of this article. Thank you for paying attention to php Chinese website!
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