这是我想做的,但是不起作用：

mystring = "hello world"
toUpper = ['a', 'e', 'i', 'o', 'u', 'y']
array = list(mystring)

for c in array:
    if c in toUpper:
        c = c.upper()
print(array) 

我的数组中“ e”和“ o”不是大写.

解决方法:

您可以使用str.translate() method一步使Python用其他字符替换字符.

使用string.maketrans() function将小写字符映射到其大写目标：

try:
    # Python 2
    from string import maketrans
except ImportError:
    # Python 3 made maketrans a static method
    maketrans = str.maketrans 

vowels = 'aeiouy'
upper_map = maketrans(vowels, vowels.upper())
mystring.translate(upper_map)

这是替换字符串中某些字符的更快,更“正确”的方法.您总是可以将mystring.translate()的结果转换为列表,但我强烈怀疑您首先要以字符串结尾.

演示：

>>> try:
...     # Python 2
...     from string import maketrans
... except ImportError:
...     # Python 3 made maketrans a static method
...     maketrans = str.maketrans 
... 
>>> vowels = 'aeiouy'
>>> upper_map = maketrans(vowels, vowels.upper())
>>> mystring = "hello world"
>>> mystring.translate(upper_map)
'hEllO wOrld'