ex13
代碼
from sys import argv#從系統(tǒng)中輸入?yún)?shù)
script, first, second, third = argv
print("The script is called:", script)
print("Your first variable is:", first)
print("Your second variable is:", second)
print("Your third variable is:", third)
總結(jié)：
后來yaung下午截圖，給我講解14，我又重新做了13，做出來了，感謝！
ex14
#ex14 提示換個傳遞的代碼練習
from sys import argv
script, user_name = argv
prompt = '> '
print("Hi %s, I'm the %s script." % (user_name, script))
print("I'd like to ask you a few questions.")
print("Do you like me %s?" % user_name)
likes = input(prompt)
print("Where do you live %s?" % user_name)
lives = input(prompt)
print("What kind of computer do you have?")
computer = input(prompt)
print("""
Alright, so you said %r about liking me.
You liking in %r. Not sure where that is.
And you have a %r computer. Nice.
""" % (likes, lives, computer))
運行結(jié)果
"C:\Program Files\Python36\python.exe" "D:/小克學(xué)習/python/項目/week two/ex14.py" Angle
Hi Angle, I'm the D:/小克學(xué)習/python/項目/week two/ex14.py script.
I'd like to ask you a few questions.
Do you like me Angle?
> like
Where do you live Angle?
> China
What kind of computer do you have?
> apple
Alright, so you said 'like' about liking me.
You liking in 'China'. Not sure where that is.
And you have a 'apple' computer. Nice.
Process finished with exit code 0
這幾章的聯(lián)系，總是有很多困難，感謝老師的指導(dǎo)。
總結(jié)：
1.在python 3. x 版本中，input（）的輸入格式發(fā)生了變化，這個得記住。
2.input是操作鍵盤的，我們得輸入，才執(zhí)行下面代碼（左側(cè)的紅色區(qū)域就是提示）
ex15
# ex15 讀取文件的練習
from sys import argv#解包，和前面的一樣
script, filename = argv
txt = open(filename)
print("Here's your file %r:" % filename)
print(txt.read ())
print("Type the filename again:")
file_again = input()
txt_again = open(file_again)
print(txt_again.read())
運行結(jié)果
"C:\Program Files\Python36\python.exe" "D:/小克學(xué)習/python/項目/week two/ex15.py" ex15_sample.txt
Here's your file 'ex15_sample.txt':
This is stuff I typed into a file.
It is really cool stuff.
Lots and lots of fun to have in here.
Type the filename again:
ex15_sample.txt
This is stuff I typed into a file.
It is really cool stuff.
Lots and lots of fun to have in here.
Process finished with exit code 0
總結(jié)：
1.這次熟悉了很多，雖然還是有運行失誤，但是自己能按照邏輯進行修改了。
2.txt文件，需要放在同一個路徑中去。
python:open/文件操作
open/文件操作f=open('/tmp/hello','w')#open(路徑+文件名,讀寫模式)#讀寫模式:r只讀,r+讀寫,w新建(會覆蓋原有文件),a追加,b二進制文件.常用模式如:'rb','wb','r+b'等等
讀寫模式的類型有：
rU 或 Ua 以讀方式打開, 同時提供通用換行符支持 (PEP 278)w 以寫方式打開，a 以追加模式打開 (從 EOF 開始, 必要時創(chuàng)建新文件)r+ 以讀寫模式打開w+ 以讀寫模式打開 (參見 w )a+ 以讀寫模式打開 (參見 a )rb 以二進制讀模式打開wb 以二進制寫模式打開 (參見 w )ab 以二進制追加模式打開 (參見 a )rb+ 以二進制讀寫模式打開 (參見 r+ )wb+ 以二進制讀寫模式打開 (參見 w+ )ab+ 以二進制讀寫模式打開 (參見 a+ )
注意：
1、使用'W'，文件若存在，首先要清空，然后（重新）創(chuàng)建，
2、使用'a'模式 ，把所有要寫入文件的數(shù)據(jù)都追加到文件的末尾，即使你使用了seek（）指向文件的其他地方，如果文件不存在，將自動被創(chuàng)建。
ex16
from sys import argv
script, filename = argv
print("We're going to erase %r." % filename)
print("If you don't want that, hit CTRL_C (^C).")
print("If you do want that, hit RETURE.")
input("?")
print("Opening the file...")
target = open(filename, 'w')
print("Truncating the file. Goodbey!")
target.truncate()
print("Now I'm going to ask you for three lines.")
line1 = input("line 1: ")
line2 = input("line 2: ")
line3 = input("line 3: ")
print("I'm going to write these to the file.")
target.write("%s \n%s \n%s" % (line1, line2, line3))
print("And finally, we close it.")
target.close()
運行結(jié)果
"C:\Program Files\Python36\python.exe" "D:/小克學(xué)習/python/項目/week two/ex16.py" ex15_sample.txt
We're going to erase 'ex15_sample.txt'.
If you don't want that, hit CTRL_C (^C).
If you do want that, hit RETURE.
?
Opening the file...
Truncating the file. Goodbey!
Now I'm going to ask you for three lines.
line 1:
line 2:
line 3:
I'm going to write these to the file.
And finally, we close it.
Process finished with exit code 0
總結(jié)：
在代碼中的，重復(fù)地方，直接用了新的格式
target.write("%s \n%s \n%s" % (line1, line2, line3))
這種寫法簡潔很多。
想問下老師為什么總是在print下面寫 target.write()，
有模糊的感覺，但是抓不住。
ex17
#ex17的練習代碼-更多的文件操作
from sys import argv
from os.path import exists
script, from_file, to_file = argv
print("Copying from %s to %s" % (from_file, to_file))
#We could do these two on one line too, how?
in_file = open(from_file)
indata = in_file.read()
print("The input file is %d bytes long" % len(indata))
print("Dose the output file exist? %r" % exists(to_file))
print("Ready, hit RETURE to continue, CTRL_C to abort.")
input()
out_file = open(to_file, 'w')
out_file.write(indata)
print("Alright, all done. ")
out_file.close()
in_file.close()
運行結(jié)果
"C:\Program Files\Python36\python.exe" "D:/小克學(xué)習/python/項目/week two/ex17.py" test.txt copied.txt
Copying from test.txt to copied.txt
The input file is 0 bytes long
Dose the output file exist? True
Ready, hit RETURE to continue, CTRL_C to abort.
cat copied.tx
Alright, all done.
Process finished with exit code 0
該命令對于任何文件都應(yīng)該是有效的。試試操作一些別的文件看看結(jié)果。不過小心別把你的重要文件給弄壞了。
Warning你看到我用 cat 這個命令了吧？它只能在 Linux 和 OSX 下面使用，使用 Windows 的就只好跟你說聲抱歉了。
做完之后發(fā)現(xiàn)不對勁，出現(xiàn)了這句話
總結(jié)：
越寫越懵逼，最好需要在晚上積累沉淀下。
