python format 逆向

Python 中的 print 函数可以使用格式化字符串来输出内容。例如，使用 {} 和 format() 方法可以在字符串中插入变量的值：
print("My name is {} and I am {} years old".format("Alice", 30))
输出：My name is Alice and I am 30 years old
也可以使用 f-strings（Python 3.6 +）来格式化输出
print(f"My name is {name} and I am {age} years old")
输出：My name is Alice and I am 30 years old

使用% 格式化输出
print("My name is %s and I am %d years old" % ("Alice", 30))
输出：My name is Alice and I am 30 years old

相关问题

pythonweb逆向

### Python Web Reverse Engineering Techniques and Methods

Reverse engineering web applications built with Python involves understanding how these applications function internally, often for purposes such as security analysis or compatibility development. Below are several key approaches:

#### Analyzing HTTP Requests and Responses
Web traffic between clients (browsers) and servers can be intercepted using tools like Wireshark or Burp Suite. By examining requests and responses, one gains insight into API endpoints, data formats exchanged, authentication mechanisms, etc.[^2]

For instance, when dealing with URL-encoded parameters within GET/POST requests, decoding them becomes essential to understand their actual values.

import urllib.parse

encoded_url = '%2Fsearch%3Fq%3Dcoding%2520interview%26cat%3Dengineering'
decoded_url = urllib.parse.unquote(encoded_url)
print(decoded_url)  # Output: /search?q=coding interview&cat=engineering

#### Disassembling Compiled Code
Python compiles source code into bytecode (.pyc files), which can then be decompiled back to readable form through various libraries such as uncompyle6 or pycdc. Understanding compiled modules helps uncover hidden functionalities not exposed via APIs directly.

Standard library components play an integral role here too; for example, `sys` module variables provide information about interpreter settings during runtime execution[^4].

import sys

# Displaying prompt strings used interactively
primary_prompt = sys.ps1 if hasattr(sys, 'ps1') else ">>> "
secondary_prompt = sys.ps2 if hasattr(sys, 'ps2') else "... "

print(f"Primary Prompt: {primary_prompt}")
print(f"Secondary Prompt: {secondary_prompt}")

#### Database Interaction Analysis
Many web services rely heavily upon databases for storing persistent states. Tools like pgAdmin III allow inspection of SQL queries executed against relational databases managed by frameworks like Django ORM or SQLAlchemy. Additionally, studying transaction management patterns implemented at lower levels provides deeper insights into application logic flow control structures[^3].

BEGIN;
LOCK TABLE my_table IN EXCLUSIVE MODE;

INSERT INTO my_table VALUES ('value');

COMMIT;

#### Link Structure Examination
Search engines leverage hyperlink relationships among pages across websites to assess relevance scores dynamically. For large-scale systems similar to those operated by major tech companies, algorithms like PageRank contribute significantly towards delivering accurate search outcomes based on interconnectedness metrics derived from crawled content[^5].

--related questions--

1. How does intercepting network communications aid in identifying potential vulnerabilities?
2. What steps should developers take to protect against reverse engineering attacks targeting proprietary business logic embedded within web apps?
3. Can you explain more about the process of converting `.pyc` files back into human-readable format?
4. In what ways do modern ORMs abstract away direct interaction with underlying storage layers compared to traditional procedural coding styles?
5. Why is analyzing inter-page connectivity crucial for improving SEO performance?

python实现逆向乘法表

以下是Python代码实现逆向乘法表：

for i in range(9, 0, -1):
    for j in range(i, 0, -1):
        print('{}x{}={}\t'.format(i, j, i*j), end='')
    print()

代码中，我们使用了两个 `range()` 函数来循环嵌套输出逆向乘法表，其中外层循环从9开始，每次递减1，直到1；内层循环则从外层循环的起始值开始，每次递减1，直到1。在循环中，我们使用了 `print()` 函数来输出每次乘法的结果，并且使用了制表符 `\t` 来实现对齐的效果。

输出的结果如下所示：

9x9=81    9x8=72    9x7=63    9x6=54    9x5=45    9x4=36    9x3=27    9x2=18    9x1=9    
8x8=64    8x7=56    8x6=48    8x5=40    8x4=32    8x3=24    8x2=16    8x1=8    
7x7=49    7x6=42    7x5=35    7x4=28    7x3=21    7x2=14    7x1=7    
6x6=36    6x5=30    6x4=24    6x3=18    6x2=12    6x1=6    
5x5=25    5x4=20    5x3=15    5x2=10    5x1=5    
4x4=16    4x3=12    4x2=8    4x1=4    
3x3=9    3x2=6    3x1=3    
2x2=4    2x1=2    
1x1=1