print (abs(1)) #Absolute value, positive numbers are themselves
print (abs(-1)) # 1
print (all([1,2,3, " 1 " , '' ])) # Calculate whether the iterable object is true, if one of them is false, it will be displayed as false
print (all( '' )) # If the iterable is empty, return True.
print (any([1,2,3, " 1 " , '' ])) # Calculate whether the iterable object is true, if one of them is true, it will be displayed as true
print (bin(3)) #Convert decimal to binary
print (hex(3)) #Convert decimal to hexadecimal
print (oct(12)) #Convert decimal to octal
print (bytes( " test " ,encoding= " utf-8 " )) # Convert the string to binary
print (chr(97)) #Print the ascii code data corresponding to 97
print (dir(all)) #Print the methods and properties of the all object
# eval("Data to be extracted") #The string data can be extracted, and the operations in the string can also be calculated
print (isinstance(1,int)) #Determine whether a data is the corresponding data type
print (globals()) #Print the current global variable
print ( __file__ ) #Print the path of the current file relative to the path
print (locals()) # print the current local variables
print(list(zip((1,2,3,4,5),("a","b","c")))) #[(1, 'a'), (2, 'b'), (3, 'c')]
print(list(zip(['a','b'],'1234'))) #[('a', '1'), ('b', '2')]
print(list(zip("hello",'12345'))) #[('h', '1'), ('e','2'), ('l', '3'), ('l', '4'), ('o', '5')]
print (max(5,10)) # 10 #Data between different types cannot be compared
li = [(1, ' b ' ),(2, ' a ' ),(3, ' d ' )]
print ( max(li)) # (3, 'd')
li = [(1, ' b ' ),(1, ' a ' ),(1, ' d ' )] #Compare the first 1 in turn to find All the same, this is just comparing the second string bad
print (max(li)) # (1, 'd')
print (max( " a10 " ,"c10","d10")) #d10
print(pow(2,3)) #2**3
print(pow(2,3,2)) #2**3%2
ret = [
{'name':'d',"age":221},
{'name':'c',"age":332},
{'name':'a',"age":89},
{'name':'b',"age":111},
]
print (max(ret,key= lambda dic:dic[ ' age ' ])) # {'name': 'c', 'age': 332}
# above max(ret,key=lambda dic:dic['age ']) is equivalent to the following for loop, assigning ret to lamba in turn for processing, and then max calculation size
v = []
for i in ret:
v.append(i['age'])
print(v) #[221, 332, 89, 111]
print(list(reversed([5,3,8,1]))) #[1, 8, 3, 5]
print (round(3.5)) # 4 4 round 5
l = " apple "
s1 = slice(3,5) # same as slice[3:5]
print (l[s1]) # le
print(sorted(["c","a","b"])) #['a', 'b', 'c'] 排序
name_dic = {'a':22,'b':33,'c':11}
print(sorted(name_dic)) #['a', 'b', 'c']
print(sorted(name_dic,key=lambda key:name_dic[key])) #['c', 'a', 'b']
print(sorted(zip(name_dic.keys(),name_dic.values()))) #[('a', 22), ('b', 33), ('c', 11)]
print (sum(range(5))) # 10, calculation and
print (sum([1,3,4,5,6])) # 19
# import 'test' error
__import__ ( " test " ) # Join is a string type; you need to import this module, you need to use __import__