Detailed introduction to the basic syntax of Python VS PHP

I have been learning Python these days. In order to facilitate my memory and better compare and understand the advantages and disadvantages of the two languages ​​​​in certain situations, I spent some time sorting out Python and PHP. Some differences in common syntax.

1. Case

PHP:

1. All user-defined functions, classes and keywords (such as if, else, echo, etc.) All variables are case-insensitive;

2. All variables are case-sensitive.

Python:

1. Case sensitive.

2. Variables

PHP：

1. Start with the “$” identifier such as $a = 1 and define

Python：

　1. Direct definition such as a = 1 method

3. Array/Collection

PHP：

// 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：

# list方式（可变）
classmates = ['Michael', 'Bob', 'Tracy']

# 调用方式
print(classmates[0])
# 'Michael'

# 末尾追加元素
classmates.append('Adam')
# ['Michael', 'Bob', 'Tracy', 'Adam']

# 指定插入位置
classmates.insert(1, 'Jack')
#['Michael', 'Jack', 'Bob', 'Tracy']

# 删除指定元素
classmates.pop(1)
#['Michael', 'Bob', 'Tracy']

What to say here Let’s take a look, Python’s array types are as follows:

1. list: linked list, ordered items, search by index, use square brackets "[]";

• test_list = [1, 2, 3, 4, 'Oh']

##tuple: Tuple, the tuple will be diverse Objects are collected together and cannot be modified. To search through the index, use brackets "()";

##test_tuple = (1, 2, 'Hello', ( 4, 5))
dict: Dictionary. A dictionary is a combination of keys and values. Searches are performed by keys. There is no order. Use large numbers. Brackets "{}";
##test_dict = {'Wang' : 1, 'Hu' : 2, 'Liu' : 4}

set: Set, unordered, elements appear only once, automatically deduplicate, use "set([])"
test_set = set( ['Wang', 'Hu', 'Liu', 4, 'Wang'])

• Print:

print(test_list)  
print(test_tuple)  
print(test_dict)  
print(test_set)

Output:

[1, 2, 3, 4, 'Oh']  
(1, 2, 'Hello', (4, 5))  
{'Liu': 4, 'Wang': 1, 'Hu': 2}  
set(['Liu', 4, 'Wang', 'Hu'])

4. Conditional judgment

PHP：

if($age = 'man'){
    echo "男";
}else if($age < 20 and $age > 14){
    echo "女";
}else{
    echo "嗯哼";
}

Python：

<p>sex = &#39;&#39;<br/>if sex == &#39;man&#39;:<br/>    print(&#39;男&#39;)<br/>elif sex == &#39;women&#39;:<br/>    print(&#39;女&#39;)<br/>else:<br/>    print(&#39;这~~&#39;)<br/></p>

5. Loop

PHP：

$arr = array('a' => '苹果', 'b' =>'三星', 'c' => '华为', 'd' => '谷歌');
foreach ($arr as $key => $value){
    echo "数组key:".$key."<br>";
    echo "key对应的value:".$value."<br>";
}

Python：

arr = {'a': '苹果', 'b': '三星', 'c': '华为', 'd': '谷歌'}

# 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])

6. Function

PHP：

function calc($number1, $number2 = 10)
{
    return $number1 + $number2;
}
print(calc(7));

Python：

def calc(number1, number2 = 10):
    sum = number1 + number2
    return sum
    
print(calc(7))

If you have any mistakes or good suggestions, please leave a message

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