Backend Development
Python Tutorial
Detailed explanation of the use of lower and upper functions in python
Detailed explanation of the use of lower and upper functions in python
I encountered a small problem today. I need to write a program to convert the irregular English names in the List into [capitalize the first letter and lowercase the rest]
The initial idea was to write a function to convert each name into uppercase. To process a name string [str], how to use map for batch processing
I have to say that the general idea is correct, but there are some problems in the detailed processing
At first, I wrote the name processing function like this:
[python] view plain copy
def change (name)
result = name[0].upper()
for a in name[1:len(name)]:
result = result + a.lower()Then an error will be reported when running
[python] view plain copy
E:\PythonFile>python practice.py
File "practice.py", line 6
for a in name(1:len(name)-1) :
^
SyntaxError: invalid syntax
E:\PythonFile>python practice.py
Traceback (most recent call last):
File "practice.py", line 11, in <module>
name_li = map (change, name_list)
File "practice.py", line 6, in change
for a in name(1,len(name)-1) :
TypeError: 'str' object is not callable
E:\PythonFile>python practice.py
Traceback (most recent call last):
File "practice.py", line 9, in <module>
name_li = map (change, name_list)
File "practice.py", line 5, in change
name[0] = name[0].upper()
TypeError: 'str' object does not support item assignment
E:\PythonFile>python practice.py
Traceback (most recent call last):
File "practice.py", line 10, in <module>
name_li = map (change, name_list)
File "practice.py", line 6, in change
name[0] = tmp
TypeError: 'str' object does not support item assignment
E:\PythonFile>python
Python 2.7.9 (default, Dec 10 2014, 12:24:55) [MSC v.1500 32 bit (Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> l = 'zxcv'
>>> print l[0]
z
>>> print l[0].upper
<built-in method upper of str object at 0x02148740>
>>> print l[0].upper()
Z
>>> z
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'z' is not defined
>>> ^Z
E:\PythonFile>python practice.py
Traceback (most recent call last):
File "practice.py", line 9, in <module>
name_li = map (change, name_list)
File "practice.py", line 6, in change
name[0] = tmp
TypeError: 'str' object does not support item assignment
E:\PythonFile>python practice.py
Traceback (most recent call last):
File "practice.py", line 13, in <module>
name_li = map (change, name_list)
File "practice.py", line 5, in change
tmp = chr(name[0])
TypeError: an integer is requiredAfter trying it a few times, I found that the general meaning is that string processing cannot be done in this way, so I checked Regarding the usage of upper() and lower(), I found that these two functions directly act on str, so there is no need to be so troublesome at all.
After modification:
[python] view plain copy
# practice.py
# Change the first char in every name from lower type to upper type
def change (name):
result = name[0:1].upper()+name[1:len(name)].lower()
return result
name_list = ['kzd','ysy','kcw','scr','ky']
name_li = map (change, name_list)
print name_lRun result:
[python] view plain copy E:\PythonFile>python practice.py ['Kzd', 'Ysy', 'Kcw', 'Scr', 'Ky']
The error is that I tried to assign and replace the elements in the string, which is not allowed.
【Related Recommendations】
1. Free video tutorial on Python
2. Introduction to python basic introduction to upper
3. How to convert uppercase and lowercase in python
The above is the detailed content of Detailed explanation of the use of lower and upper functions in python. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
Choosing Between PHP and Python: A Guide
Apr 18, 2025 am 12:24 AM
PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.
Python vs. JavaScript: The Learning Curve and Ease of Use
Apr 16, 2025 am 12:12 AM
Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.
Can vs code run in Windows 8
Apr 15, 2025 pm 07:24 PM
VS Code can run on Windows 8, but the experience may not be great. First make sure the system has been updated to the latest patch, then download the VS Code installation package that matches the system architecture and install it as prompted. After installation, be aware that some extensions may be incompatible with Windows 8 and need to look for alternative extensions or use newer Windows systems in a virtual machine. Install the necessary extensions to check whether they work properly. Although VS Code is feasible on Windows 8, it is recommended to upgrade to a newer Windows system for a better development experience and security.
Can visual studio code be used in python
Apr 15, 2025 pm 08:18 PM
VS Code can be used to write Python and provides many features that make it an ideal tool for developing Python applications. It allows users to: install Python extensions to get functions such as code completion, syntax highlighting, and debugging. Use the debugger to track code step by step, find and fix errors. Integrate Git for version control. Use code formatting tools to maintain code consistency. Use the Linting tool to spot potential problems ahead of time.
PHP and Python: A Deep Dive into Their History
Apr 18, 2025 am 12:25 AM
PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.
How to run programs in terminal vscode
Apr 15, 2025 pm 06:42 PM
In VS Code, you can run the program in the terminal through the following steps: Prepare the code and open the integrated terminal to ensure that the code directory is consistent with the terminal working directory. Select the run command according to the programming language (such as Python's python your_file_name.py) to check whether it runs successfully and resolve errors. Use the debugger to improve debugging efficiency.
Is the vscode extension malicious?
Apr 15, 2025 pm 07:57 PM
VS Code extensions pose malicious risks, such as hiding malicious code, exploiting vulnerabilities, and masturbating as legitimate extensions. Methods to identify malicious extensions include: checking publishers, reading comments, checking code, and installing with caution. Security measures also include: security awareness, good habits, regular updates and antivirus software.
