“Python is a truly beautiful language. When someone comes up with a good idea, it takes about a minute and five lines of code to write something that almost meets your requirements. Then it only takes an hour to scale the script up to 300 lines, and it’s still pretty much what you need.” -Jack Jansen
Click here and the code will run
1. Print the string N times
You might use a loop to print the string N times. But I’ll show you a nice way to print a string N times in a small line of code.
string = "Python "
ntimes = string * 3
print(ntimes) # Python Python Python
Copy the code2. The function returns multiple values
Sometimes functions need to return multiple values. We can do this as follows:
def MultiReturn() :
return 1.2.3
a, b, c = MultiReturn()
print(a,b,c) # 1, 2, 3
Copy the code3. Import the module file path
Did you know that we can get the file path of any imported module in Python? This is a great feature when you need to know the path to a module. See the following code example:
import os
import json
print(os) # <module 'os' from '/usr/lib/python3.6/os.py'>
print(json) # < module 'json' from '/ usr/lib/python3.6 / json/set p y' >
Copy the code4. Quickly invert strings
To understand the following code, you may need to delve into Python slicing operations.
string = "Python"
print(string[::-1]) # nohtyP
Copy the codeGrammar: string [start: end: stop]
start: Start position, default is 0end: End position. The default value is a string lengthstopThe: parameter can be omitted. The default value is 1. It can be negative to indicate reverse order.
5. Multivariable assignment
Many other languages C++, Java, and JavaScript allow only one assignment to a variable. But Python allows you to perform multiple assignments, which can be useful in different situations.
a, b = 1.2
print(a,b) # 1 2
Copy the code6. Go to heavy
In Python, you no longer need to loop to remove duplicates from lists; you can use built-in functions to do this quickly and easily. Look at the code below.
lst1 = [1.3.3.4.5.1]
lst2 = ["A"."A"."B"."C"."D"."D"]
print(set(lst1)) # {1, 3, 4, 5}
print(set(lst2)) # {'A', 'B', 'C', 'D'}
Copy the code7. Format the string
You usually use the + unary operator to format strings. In short, when you want to append a variable to a string, you can use the unary operator +. But I’ll show you how to do this formatting in a quick and easy way.
name = "John"
age = 23
# method 1
print("My name is " + name + " and I am " + str(age)) # My name is John and I am 23
# method 2
print("My name is {0} and I am {1}".format(name, age)) # My name is John and I am 23
# method 3
print(f"My name is {name} and I am {age}") # My name is John and I am 23
Copy the code8. Initialize variables
You can initialize empty containers in Python. In short, you can declare data structures without assigning values or populating them.
lst = [] Initialize an empty list
dct = {} Initialize an empty dictionary
tpl = () Initialize an empty tuple
set = set(a)Initialize an empty collection
Copy the code9. Do your Python objects take up memory?
Did you know that Python’s built-in module SYS can tell you how much memory an object consumes in Python?
import sys
print(sys.getsizeof(1)) # 28
print(sys.getsizeof(1.0)) # 24
print(sys.getsizeof(True)) # 1
print(sys.getsizeof(None)) # 1
print(sys.getsizeof("Hello")) # 56
print(sys.getsizeof([])) # 40
print(sys.getsizeof(())) # 40
print(sys.getsizeof({})) # 40
print(sys.getsizeof(set())) # 40
Copy the codeReverse the list
Refer to # 4 of this article to reverse strings.
lst = [1.3.3.4.5.1]
print(lst[::-1]) # [1, 5, 4, 3, 3, 1]
Copy the code11. Reverse the dictionary
I’ll share a sample code to reverse dictionaries. In short, keys and values will swap their positions.
dict = {'x' : 1.'y' : 2.'z' : 3}
new_dict = { value : key for key , value in dict.items()}
print(new_dict) # {1: 'x', 2: 'y', 3: 'z'}
## Try the following code and be surprised
dict = {'x' : 1.'y' : 2.'z' : 2}
new_dict = { value : key for key , value in dict.items()}
print(new_dict) # {1: 'x', 2: 'z'}
Copy the code12. More advanced multivariable assignment
Earlier in this article, we learned how to do multivariable replication. In this tip, we will learn advanced methods of multivariable replication.
a, *b, c, d = 3.4.5.6.7
print(a) # 3
print(b) # [4, 5]
print(c) # 6
print(d) # 7
## ⚠️ Try the following code
a, *b, c= 3.4.5.6.7
print(a) # 3
print(b) # [4, 5, 6]
print(c) # 7
Copy the code13. String in connection list
You might use a loop to iterate through a list and concatenate each item in the list. But it takes a lot of lines of code to do that. The join() method can be used to do this quickly and easily.
lst = ['a'.'b'.'c']
print(' '.join(lst)) # abc
Copy the code14. Merge dictionaries
dict1 = {'a' : 1.'b' : 2}
dict2 = {'c' : 3.'d' : 4}
dict3 = {**dict1, **dict2}
print(dict3) # {'a': 1, 'b': 2, 'c': 3, 'd': 4}
Copy the code15. Is there a limit to how many times Python recurses?
Python actually sets the recursive limit to 1000 by default when using recursive functions, but the limit can be changed by using the following code:
import sys
current_recursion_limit = sys.getrecursionlimit()
print(current_recursion_limit) # 1000
set_limit = sys.setrecursionlimit(2000)
print(set_limit) # 2000
Copy the code16. How to pick out files with the suffix XLS or XLSX?
You’ve probably used the startWith and endWith methods to search for prefixes or suffixes in strings. But you don’t necessarily know that they can use multiple conditions.
string1 = 'abc.xls'
# method 1
if string1.endswith('.xls') or string1.endswith('.xlsx') :print('Yes')
# method 2
if string1.endswith(('.xls'.'.xlsx')) :print('Yes')
Copy the code17. Learn to substitute in for multiple if statements
a = [1.2.3]
x = 1
# method 1
if a[0] == x or a[1] == x or a[2] == x:
print('Number X is present in the list')
# method 2
if x in a:
print('Number X is present in the list')
Copy the codesection
The 17 python tips shared above will help you!
Welcome everyone to like, favorites, support!
Pythontip, Happy Coding!
Public number: quark programming