CODEWITHSUNDEEP
python
gudlife
gudlife

Reputation: 480

Format string in python

I have to write one string as follows:

A = 55
B = 45

res = 'A =' + str(A) + '\n' + \
            'B = ' + str(B)

The A and B have to be separated into two lines.

print res

Result is correct. However, if i have other variables such as C,D,E, etc. doing one by one as in my code is difficult. What is shorter and easier way for doing it?

Upvotes: 2

Views: 149

Answers (5)

nekomatic
nekomatic

Reputation: 6284

A = 45
B = 55
C = 65

names = ['A', 'B', 'C'] # list of variable names
res = '\n'.join([varname + ' =' + str(locals()[varname]) for varname in names])

This does what you've asked for, but if it's going to be used in a practical program I would look at other methods for storing and retrieving the data such as a dictionary.

Upvotes: -1

pacholik
pacholik

Reputation: 8992

If you want to process all your variables (e.g. you are in function) you can use locals

def f():
    A = 55
    B = 45
    C = 35
    D = 25
    print("\n".join("{} = {}".format(k, v) for k,v in locals().items()))

in action:

>>> f()
A = 55
B = 45
C = 35
D = 25

Otherwise we have to know which variables do you want to process - for example, use OrderedDict:

d = OrderedDict([
("A", 55),
("B", 45),
("C", 35),
("D", 25),
])

print("\n".join("{} = {}".format(k, v) for k,v in d.items()))

Upvotes: 1

ralh
ralh

Reputation: 2594

You could make a dictionary of the values and iterate over it:

values = {
    'A': 56,
    'B': 32,
    'C': 34
}

res = ''
for key in values:
    res += key + ' = ' + str(values[key]) + '\n'

If you want to have the values in order, you should use an OrderedDict, as suggested in the answer by Peter Woods.

Upvotes: 2

Sdwdaw
Sdwdaw

Reputation: 1037

First of all don't start variable names from uppercase. If you want to print all values you should have more usefull data structure. Like list or dictionary.

>>> dictionary = {'a':55, 'b':45, 'c':65}
>>> for key, value in dictionary.items():
...     print str(key) + ' = ' + str(value)
... 
a = 55
c = 65
b = 45

If you want to have sorted output, create a list of strings first:

>>> list = []
>>> for key, value in dictionary.iteritems():
...     list.append(str(key) + ' = ' + str(value))
... 
>>> list
['a = 55', 'c = 65', 'b = 45']
>>> for el in sorted(list):
...     print el
... 
a = 55
b = 45
c = 65

Upvotes: 0

SuperBiasedMan
SuperBiasedMan

Reputation: 9979

You can use str.format to determine res easier:

res = 'A ={}\nB = {}'.format(A, B)

The {} are replaced with the parameters that you pass to format and you can pass in as many as you want.

Upvotes: 1

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