随笔分类 -  Python Learning

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String methods
摘要：A method is similar to a function – it takes arguments and returns a value – but the syntax is different. For example, the method upper takes a string... 阅读全文
posted @ 2014-06-29 15:22 平静缓和用胸音说爱 阅读(284) 评论(0) 推荐(0)
Find and counter
摘要：Find: In a sense, find is the opposite of the [] operator. Instead of taking an index and extracting the corresponding character, it takes a... 阅读全文
posted @ 2014-06-23 22:06 平静缓和用胸音说爱 阅读(245) 评论(0) 推荐(0)
Strings are immutable
摘要：It is tempting to use the [] operator on the left side of an assignment, with the intention of changing a character in a string. The ‘object... 阅读全文
posted @ 2014-06-23 10:51 平静缓和用胸音说爱 阅读(275) 评论(0) 推荐(0)
String slices
摘要：String slicesA segment of a string is called a slice. Selecting a slice is similar selecting a character: The operator [n:m] returns the par... 阅读全文
posted @ 2014-06-20 17:33 平静缓和用胸音说爱 阅读(217) 评论(0) 推荐(0)
Traversal with a for loop
摘要：A lot of computations involve processing a string one character at a time. Often they start at the beginning, select each character in turn, do someth... 阅读全文
posted @ 2014-06-20 16:21 平静缓和用胸音说爱 阅读(169) 评论(0) 推荐(0)
String build-in function - len
摘要：len is a build-in function that returns the numbers of characters in a string: Since we started counting at zero, the last index should be 5... 阅读全文
posted @ 2014-06-18 19:18 平静缓和用胸音说爱 阅读(255) 评论(0) 推荐(0)
A string is a sequence
摘要：A string is a sequence of characters. You can access the characters one at a time with the bracket operator. The second statement selects ch... 阅读全文
posted @ 2014-06-18 19:02 平静缓和用胸音说爱 阅读(148) 评论(0) 推荐(0)
Square roots
摘要：Loops are often used in programs that compute numerical results by starting with an approximate answer and iteratively improving it.For example, one w... 阅读全文
posted @ 2014-06-18 15:24 平静缓和用胸音说爱 阅读(556) 评论(0) 推荐(0)
The while statement
摘要：Computers are often used to automate repetitive tasks. Repeating identical or similar tasks without making errors is something that computers do well ... 阅读全文
posted @ 2014-06-10 14:44 平静缓和用胸音说爱 阅读(329) 评论(0) 推荐(0)
Keyboard input
摘要：Keyboard inputPython provides a build-in function called raw_input (in version 2.x) that gets input from the keyboard. In Python 3.x we use input(). W... 阅读全文
posted @ 2014-05-01 15:28 平静缓和用胸音说爱 阅读(342) 评论(0) 推荐(0)
Recursion
摘要：RecursionIt is legal for one function to call another; it is also legal for a function to call itself. It may not be obvious why what is a good thing,... 阅读全文
posted @ 2014-05-01 15:07 平静缓和用胸音说爱 阅读(264) 评论(0) 推荐(0)
Conditionals
摘要：1. Modulus operator (%)The modulus operator works on integers and yields the remainder when the first operand is divided by the second. In Python, the... 阅读全文
posted @ 2014-04-28 18:10 平静缓和用胸音说爱 阅读(523) 评论(0) 推荐(0)
TurtleWorld Exercises
摘要：1. Write a function called square that takes a parameter named t, which is a turtle. It should use the turtle to draw a square.from TurtleWorld import... 阅读全文
posted @ 2014-04-24 16:13 平静缓和用胸音说爱 阅读(255) 评论(0) 推荐(0)
Python TurtleWorld configuration and simple test
摘要：TurtleWorld provides a set of functions for drawing lines by steering turtles around the screen. You can download Swampy from allendowney.com/swampy.U... 阅读全文
posted @ 2014-04-24 14:05 平静缓和用胸音说爱 阅读(530) 评论(0) 推荐(0)
Why functions - Not only for python
摘要：It may not be clear why it is worth the trouble to divide a program into functions. There are a lot of reasons; here are few:Creating a new function gives you an opportunity to name a group of statements, which makes your program easier to read and debug.Functions can make a program smaller by elimi 阅读全文
posted @ 2014-04-11 19:17 平静缓和用胸音说爱 阅读(192) 评论(0) 推荐(0)
The python programing language
摘要：Python is an example of high-level language. As you might infer from the name “high-level language”, there are also low-level languages, sometimes referred to as “machine languages” or “assembly languages”. Loosely speaking, computers can only execute programs written in low-level languages. So prog 阅读全文
posted @ 2014-04-08 17:41 平静缓和用胸音说爱 阅读(423) 评论(0) 推荐(0)

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