一 實戰——字串和文字

1 ex6.py

# -- coding: utf-8 --
x = "There are %d types of people." % 10
binary = "binary"
do_not = "don't"
y = "Those who know %s and those who %s." % (binary, do_not)
print x
print y
# 用%r顯示的是變數“原始”的資料值，%r 在列印的時候能夠重現它代表的物件，但其他的符號用來給使用者顯示變數值。
print "I said: %r." % x
print "I also said: '%s'." % y
hilarious = False
joke_evaluation = "Isn't that joke so funny?! %r"
print joke_evaluation % hilarious
w = "This is the left side of..."
e = "a string with a right side."
print w + e
#有些情況下，%s和%s處理的結果是一樣的，比如說處理int型物件。
print "I am %d years old." % 22
print "I am %s years old." % 22
print "I am %r years old." % 22
text = "I am %d years old." % 22
#有些情況兩者就不同了，%r會加單引號
print "I said: %s." % text
print "I said: %r." % text
#另外一些情況
import datetime
d = datetime.date.today()
print "%s" % d
print "%r" % d
 

2 執行結果

PS C:\Users\cakin> python ex6.py

D:\Python27\python.exe: can't open file 'ex6.py': [Errno 2] No such file or directory

PS C:\Users\cakin> cd E:\Python\exercise

PS E:\Python\exercise> python ex6.py

There are 10 types of people.

Those who know binary and those who don't.

I said: 'There are 10 types of people.'.

I also said: 'Those who know binary and those who don't.'.

Isn't that joke so funny?! False

This is the left side of...a string with a right side.

I am 22 years old.

I am 22 years old.

I am 22 years old.

I said: I am 22 years old..

I said: 'I am 22 years old.'.

2018-11-18

datetime.date(2018, 11, 18)

二 實戰——更多的列印

1 ex7.py

print "Mary had a little lamb."
print "Its fleece was white as %s." % 'snow'
print "And everywhere that Mary went."
print "." * 10 # what'd that do?
end1 = "C"
end2 = "h"
end3 = "e"
end4 = "e"
end5 = "s"
end6 = "e"
end7 = "B"
end8 = "u"
end9 = "r"
end10 = "g"
end11 = "e"
end12 = "r"
# watch that comma at the end. try removing it to see what happens
print end1 + end2 + end3 + end4 + end5 + end6,
print end7 + end8 + end9 + end10 + end11 + end12

2 測試結果

PS E:\Python\exercise> python ex7.py

Mary had a little lamb.

Its fleece was white as snow.

And everywhere that Mary went.

..........

Cheese Burger

三 實戰——列印, 列印

1 ex8.py

formatter = "%r %r %r %r"
print formatter % (1, 2, 3, 4)
print formatter % ("one", "two", "three", "four")
print formatter % (True, False, False, True)
print formatter % (formatter, formatter, formatter, formatter)
print formatter % (
"I had this thing.",
"That you could type up right.",
"But it didn't sing.",
"So I said goodnight."
)

2 測試結果

PS E:\Python\exercise> python ex8.py

1 2 3 4

'one' 'two' 'three' 'four'

True False False True

'%r %r %r %r' '%r %r %r %r' '%r %r %r %r' '%r %r %r %r'

'I had this thing.' 'That you could type up right.' "But it didn't sing." 'So I said goodnight.'

四 實戰——列印, 列印, 列印

1 ex9.py

# Here's some new strange stuff, remember type it exactly.
days = "Mon Tue Wed Thu Fri Sat Sun"
months = "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug"
print "Here are the days: ", days
print "Here are the months: ", months
print """
There's something going on here.
With the three double-quotes.
We'll be able to type as much as we like.
Even 4 lines if we want, or 5, or 6.
"""

2 測試結果

PS E:\Python\exercise> python ex9.py

Here are the days:  Mon Tue Wed Thu Fri Sat Sun

Here are the months:  Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

There's something going on here.

With the three double-quotes.

We'll be able to type as much as we like.

Even 4 lines if we want, or 5, or 6.

五 實戰——列印, 列印, 列印、列印

1 ex10.py

tabby_cat = "\tI'm tabbed in."
persian_cat = "I'm split\non a line."
backslash_cat = "I'm \\ a \\ cat."
fat_cat = """
I'll do a list:
\t* Cat food
\t* Fishies
\t* Catnip\n\t* Grass
"""
print tabby_cat
print persian_cat
print backslash_cat
print fat_cat

2 測試結果

PS E:\Python\exercise> python ex10.py

        I'm tabbed in.

I'm split

on a line.

I'm \ a \ cat.

I'll do a list:

        * Cat food

        * Fishies

        * Catnip

        * Grass