亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱

Home Backend Development Python Tutorial Usage of Template class string template in Python's string module

Usage of Template class string template in Python's string module

Jul 06, 2016 pm 01:29 PM
python string template string template

string.Template()
string.Template()內(nèi)添加替換的字符, 使用"$"符號(hào), 或 在字符串內(nèi), 使用"${}"; 調(diào)用時(shí)使用string.substitute(dict)函數(shù).
可以通過(guò)繼承"string.Template", 覆蓋變量delimiter(定界符)和idpattern(替換格式), 定制不同形式的模板.

代碼:

# -*- coding: utf-8 -*- 

import string 
 
template_text = ''''' 
  Delimiter : %% 
  Replaced : %with_underscore 
  Ingored : %notunderscored 
''' 
 
d = {'with_underscore' : 'replaced', 
   'notunderscored' : 'not replaced'} 
 
class MyTemplate(string.Template): 
  delimiter = '%' 
  idpattern = '[a-z]+_[a-z]+' 
   
t = MyTemplate(template_text) 
print('Modified ID pattern: ') 
print(t.safe_substitute(d)) 

輸出:

Modified ID pattern:  
 
  Delimiter : % 
  Replaced : replaced 
  Ingored : %notunderscored 

注意: 定界符(delimiter)為"%", 替換模式(idpattern)必須包含下劃線, 所以第2個(gè)沒(méi)有進(jìn)行替換.

正則替換

string.Template的pattern是一個(gè)正則表達(dá)式, 可以通過(guò)覆蓋pattern屬性, 定義新的正則表達(dá)式.
如: 使用新的定界符"{{", 把{{var}}作為變量語(yǔ)法.

代碼:

import string 
 
t = string.Template('$var') 
print(t.pattern.pattern) 
 
class MyTemplate(string.Template): 
  delimiter = '{{' 
  pattern = r''''' 
  \{\{(?: 
   (&#63;P<escaped>\{\{) |  # Escape sequence of two delimiters 
   (&#63;P<named>[_a-z][_a-z0-9]*)\}\}   |  # delimiter and a Python identifier 
   {(&#63;P<braced>[_a-z][_a-z0-9]*)}\}\}  |  # delimiter and a braced identifier 
   (&#63;P<invalid>)       # Other ill-formed delimiter exprs 
  ) 
  ''' 
   
t2 = MyTemplate(''''' 
{{{{ 
{{var}} 
''') 
 
print('MATCHES: ', t2.pattern.findall(t2.template)) 
print('SUBSTITUTED: ', t2.safe_substitute(var='replacement')) 

輸出:

  \$(&#63;: 
   (&#63;P<escaped>\$) |  # Escape sequence of two delimiters 
   (&#63;P<named>[_a-z][_a-z0-9]*)   |  # delimiter and a Python identifier 
   {(&#63;P<braced>[_a-z][_a-z0-9]*)}  |  # delimiter and a braced identifier 
   (&#63;P<invalid>)       # Other ill-formed delimiter exprs 
  ) 
   
MATCHES: [('{{', '', '', ''), ('', 'var', '', '')] 
SUBSTITUTED:  
{{ 
replacement 

字符串模板的安全替換(safe_substitute)
字符串模板(sting.Template), 替換時(shí), 使用substitute(), 未能提供模板所需的全部參數(shù)值時(shí), 會(huì)發(fā)生異常.
如果使用safe_substitute(), 即安全替換, 則會(huì)替換存在的字典值, 保留未存在的替換符號(hào).

代碼:

import string 
 
values = {'var' : 'foo'} 
 
t = string.Template('''''$var is here but $ missing is not provided! ''') 
 
 
try: 
  print 'substitute() : ', t.substitute(values) 
except ValueError as err: 
  print 'Error:', str(err) 
   
print 'safe_substitude() : ', t.safe_substitute(values) 

輸出:

substitute() : Error: Invalid placeholder in string: line 1, col 18 
safe_substitude() : foo is here but $ missing is not provided!  


Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How to use PHP combined with AI to achieve text error correction PHP syntax detection and optimization How to use PHP combined with AI to achieve text error correction PHP syntax detection and optimization Jul 25, 2025 pm 08:57 PM

To realize text error correction and syntax optimization with AI, you need to follow the following steps: 1. Select a suitable AI model or API, such as Baidu, Tencent API or open source NLP library; 2. Call the API through PHP's curl or Guzzle and process the return results; 3. Display error correction information in the application and allow users to choose whether to adopt it; 4. Use php-l and PHP_CodeSniffer for syntax detection and code optimization; 5. Continuously collect feedback and update the model or rules to improve the effect. When choosing AIAPI, focus on evaluating accuracy, response speed, price and support for PHP. Code optimization should follow PSR specifications, use cache reasonably, avoid circular queries, review code regularly, and use X

PHP calls AI intelligent voice assistant PHP voice interaction system construction PHP calls AI intelligent voice assistant PHP voice interaction system construction Jul 25, 2025 pm 08:45 PM

User voice input is captured and sent to the PHP backend through the MediaRecorder API of the front-end JavaScript; 2. PHP saves the audio as a temporary file and calls STTAPI (such as Google or Baidu voice recognition) to convert it into text; 3. PHP sends the text to an AI service (such as OpenAIGPT) to obtain intelligent reply; 4. PHP then calls TTSAPI (such as Baidu or Google voice synthesis) to convert the reply to a voice file; 5. PHP streams the voice file back to the front-end to play, completing interaction. The entire process is dominated by PHP to ensure seamless connection between all links.

How to develop AI intelligent form system with PHP PHP intelligent form design and analysis How to develop AI intelligent form system with PHP PHP intelligent form design and analysis Jul 25, 2025 pm 05:54 PM

When choosing a suitable PHP framework, you need to consider comprehensively according to project needs: Laravel is suitable for rapid development and provides EloquentORM and Blade template engines, which are convenient for database operation and dynamic form rendering; Symfony is more flexible and suitable for complex systems; CodeIgniter is lightweight and suitable for simple applications with high performance requirements. 2. To ensure the accuracy of AI models, we need to start with high-quality data training, reasonable selection of evaluation indicators (such as accuracy, recall, F1 value), regular performance evaluation and model tuning, and ensure code quality through unit testing and integration testing, while continuously monitoring the input data to prevent data drift. 3. Many measures are required to protect user privacy: encrypt and store sensitive data (such as AES

python seaborn jointplot example python seaborn jointplot example Jul 26, 2025 am 08:11 AM

Use Seaborn's jointplot to quickly visualize the relationship and distribution between two variables; 2. The basic scatter plot is implemented by sns.jointplot(data=tips,x="total_bill",y="tip",kind="scatter"), the center is a scatter plot, and the histogram is displayed on the upper and lower and right sides; 3. Add regression lines and density information to a kind="reg", and combine marginal_kws to set the edge plot style; 4. When the data volume is large, it is recommended to use "hex"

How to develop AI-based text summary with PHP Quick Refining Technology How to develop AI-based text summary with PHP Quick Refining Technology Jul 25, 2025 pm 05:57 PM

The core of PHP's development of AI text summary is to call external AI service APIs (such as OpenAI, HuggingFace) as a coordinator to realize text preprocessing, API requests, response analysis and result display; 2. The limitation is that the computing performance is weak and the AI ecosystem is weak. The response strategy is to leverage APIs, service decoupling and asynchronous processing; 3. Model selection needs to weigh summary quality, cost, delay, concurrency, data privacy, and abstract models such as GPT or BART/T5 are recommended; 4. Performance optimization includes cache, asynchronous queues, batch processing and nearby area selection. Error processing needs to cover current limit retry, network timeout, key security, input verification and logging to ensure the stable and efficient operation of the system.

How to use PHP combined with AI to analyze video content PHP intelligent video tag generation How to use PHP combined with AI to analyze video content PHP intelligent video tag generation Jul 25, 2025 pm 06:15 PM

The core idea of PHP combining AI for video content analysis is to let PHP serve as the backend "glue", first upload video to cloud storage, and then call AI services (such as Google CloudVideoAI, etc.) for asynchronous analysis; 2. PHP parses the JSON results, extract people, objects, scenes, voice and other information to generate intelligent tags and store them in the database; 3. The advantage is to use PHP's mature web ecosystem to quickly integrate AI capabilities, which is suitable for projects with existing PHP systems to efficiently implement; 4. Common challenges include large file processing (directly transmitted to cloud storage with pre-signed URLs), asynchronous tasks (introducing message queues), cost control (on-demand analysis, budget monitoring) and result optimization (label standardization); 5. Smart tags significantly improve visual

PHP integrated AI emotional computing technology PHP user feedback intelligent analysis PHP integrated AI emotional computing technology PHP user feedback intelligent analysis Jul 25, 2025 pm 06:54 PM

To integrate AI sentiment computing technology into PHP applications, the core is to use cloud services AIAPI (such as Google, AWS, and Azure) for sentiment analysis, send text through HTTP requests and parse returned JSON results, and store emotional data into the database, thereby realizing automated processing and data insights of user feedback. The specific steps include: 1. Select a suitable AI sentiment analysis API, considering accuracy, cost, language support and integration complexity; 2. Use Guzzle or curl to send requests, store sentiment scores, labels, and intensity information; 3. Build a visual dashboard to support priority sorting, trend analysis, product iteration direction and user segmentation; 4. Respond to technical challenges, such as API call restrictions and numbers

PHP integrated AI intelligent image processing PHP image beautification and automatic editing PHP integrated AI intelligent image processing PHP image beautification and automatic editing Jul 23, 2025 pm 07:12 PM

PHP integrated AI image processing requires the help of a third-party API or local model, which cannot be directly implemented; 2. Use ready-made services such as Google CloudVision API to quickly realize facial recognition, object detection and other functions. The advantages are fast development and strong functions. The disadvantages are that they need to pay, rely on the network and have data security risks; 3. Deploy local AI models through PHP image library such as Imagick or GD combined with TensorFlowLite or ONNXRuntime. It can be customized, the data is safer, and the cost is low, but the development is difficult and requires AI knowledge; 4. Mixed solutions can combine the advantages of API and local model, such as using API for detection and beautification of local models; 5. Selecting AI image processing API should be comprehensive

See all articles