Python 字串處理技巧詳解

>>> '{} plus {} equals {}'.format(4, 5, 'Nine')
'4 plus 5 equals Nine'

>>> "My Name is {0} and I am from {1}".format("Milinda", "USA")
'My Name is Milinda and I am from USA'

>>> "I am {0} years old. I Love to work on {PC} Laptop".format(25, PC="APPLE")
'I am 25 years old. I Love to work on APPLE Laptop'

>>> Str1 = "C C++ JAVA Python"
>>> Str1.split()
['C', 'C++', 'JAVA', 'Python']

>>> TOP_10_Company = "TCS,INFOSYS,GOOGLE,MICROSOFT,YAHOO"
>>> Company = TOP_10_Company.split(",")
>>> print(Company)
['TCS', 'INFOSYS', 'GOOGLE', 'MICROSOFT', 'YAHOO']
>>> for c in Company:
...     print(c)
TCS
INFOSYS
GOOGLE
MICROSOFT
YAHOO

>>> S = "Python Programming"
>>> S.isalnum()
False
>>> S = "Python"
>>> S.isalnum()
True
>>> P = "1Jhon"
>>> P.isalnum()
True

>>> Str1 = "Python Programming"
>>> Str1.endswith("Programming")
True
>>> Str1.startswith("Python")
True
>>> Str1.find("Prog")
7
>>> Str1.rfind("o")
9
>>> Str1.count("o")
3

>>> S = "Hello World"
>>> S.upper()
'HELLO WORLD'
>>> S.lower()
'hello world'

Str1 = "hello"
print(Str1.capitalize())  # 輸出：Hello

Str1 = "INDIA"
print(Str1.lower())  # 輸出：india

Str1 = "iitbombay"
print(Str1.upper())  # 輸出：IITBOMBAY

Str1 = "welcome to the world of programming"
print(Str1.title())  # 輸出：Welcome To The World Of Programming

Str1 = "IncreDible India"
print(Str1.swapcase())  # 輸出：iNCREdIBLE iNDIA

S1 = "I have brought two chocolates, two cookies and two cakes"
S2 = S1.replace("two", "three")
print(S2)  # 輸出：I have brought three chocolates, three cookies and three cakes

S1 = "I have brought two chocolates, two cookies and two cakes"
print(S1.replace("two", "three", 2))  # 輸出：I have brought three chocolates, three cookies and two cakes

Scentence1 = "   Hey Cool!!."
print(Scentence1.lstrip())  # 輸出：Hey Cool!!.

Scentence1 = "Welcome!!!\n\n\ "
print(Scentence1.rstrip())  # 輸出：Welcome!!!

Str1 = "   Hey,How are you!!!\t\t\t "
print(Str1.strip())  # 輸出：Hey,How are you!!!

s1 = "@Cost Prize of Apple Laptop is at Rs = 20 Dollars $$$$"
print(s1.strip('@$'))  # 輸出：Cost Prize of Apple Laptop is at Rs = 20 Dollars 

S1 = "APPLE MACOS"
print(S1.center(15))  # 輸出：   APPLE MACOS  

S1 = "APPLE MACOS"
print(S1.ljust(15))  # 輸出：APPLE MACOS    

S1 = "APPLE MACOS"
print(S1.rjust(15))  # 輸出：    APPLE MACOS

def countB(word):
    count = 0
    for b in word:
        if b == 'b':
            count += 1
    return count

print("Number of 'b' =", countB("abbbabbaaa"))

def count_Letter(word, letter):
    count = 0
    for i in word:
        if i == letter:
            count += 1
    print("Number of occurrences of '{}' is {}".format(letter, count))

count_Letter("abbbabbaaa", 'b')

def count_letter(word, letter):
    count = 0
    for i in word:
        if i == letter:
            count += 1
    return count

x = count_letter('INIDA', 'I')
print(x)

def modify_case(word):
    print("原始字串 =", word)
    print("轉換大小寫後 =", end="")
    return word.swapcase()

print(modify_case("hi Python is interesting, isn't it ? "))

def get_char(word, pos):
    print("字串 =", word)
    print("位置", pos, "的字元 =", end="")
    counter = 0
    for i in word:
        counter += 1
        if counter == pos:
            return i

print(get_char("Addicted to Python ", 3))

def eliminate_letter(word, letter):
    print("原始字串 =", word)
    print("移除字母後：", letter)
    print("結果 =", end="")
    new_str = word.replace(letter, "")
    return new_str

x = eliminate_letter('PYTHON PROGRAMMING', 'P')
print(x)

def count_vowels(word):
    print("字串 =", word)
    word = word.lower()
    return {v: word.count(v) for v in 'aeiou'}

print(count_vowels("I Love Python Programming"))

def upper_case_vowels(word):
    new_word = ''
    print("原始字串 =", word)
    print("轉換母音為大寫後")
    print("結果 =", end="")
    for i in word:
        if i in 'aeiou':
            new_word += i.upper()
        else:
            new_word += i
    return new_word

x = upper_case_vowels('aehsdfiou')
print(x)

def dec_bin(x):
    k = []
    n = x
    while n > 0:
        a = int(n % 2)
        k.append(a)
        n = (n - a) / 2
    k.append(0)
    string = ""
    for j in k[::-1]:
        string += str(j)
    if len(string) > 4:
        print(string[1:], end=' ')
    elif len(string) > 3:
        print(string, end=' ')
    elif len(string) > 2:
        print('0' + string, end=' ')
    else:
        print('00' + string, end=' ')

def hex_to_bin(h):
    for ch in h:
        if 'A' <= ch <= 'F':
            dn = 10 + (ord(ch) - ord('A'))
            dec_bin(dn)
        else:
            dn = int(ch)
            dec_bin(dn)

n = input('請輸入十六進位數字：')
print('等效二進位數字為：')
hex_to_bin(n.upper())